AT-GS950/16PS
Gigabit Ethernet PoE+ Switch
AT-GS950/16PS Switch Web Interface User’s Guide
AT-S112
613-001779 Rev A
[1.00.010]
Copyright © 2013 Allied Telesis, Inc.
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesis,
Inc.
Allied Telesis and the Allied Telesis logo are trademarks of Allied Telesis, Incorporated. All other product names,
company names, logos or other designations mentioned herein are trademarks or registered trademarks of their respective
owners.
Allied Telesis, Inc. reserves the right to make changes in specifications and other information contained in this document
without prior written notice. The information provided herein is subject to change without notice. In no event shall Allied
Telesis, Inc. be liable for any incidental, special, indirect, or consequential damages whatsoever, including but not limited
to lost profits, arising out of or related to this manual or the information contained herein, even if Allied Telesis, Inc. has
been advised of, known, or should have known, the possibility of such damages.
Contents
List of Figures .................................................................................................................................................. 9
List of Tables ................................................................................................................................................. 13
Preface ............................................................................................................................................................ 15
Document Conventions.............................................................................................................................. 16
Allied Telesis Contact Information.............................................................................................................. 17
Getting Started ................................................................................................................................................ 19
Chapter 1: Starting a Web Browser Session ................................................................................................ 21
Establishing a Remote Connection to the Web Browser Interface ............................................................ 22
Web Browser Tools.................................................................................................................................... 25
Quitting a Web Browser Management Session ......................................................................................... 26
Chapter 2: System Configuration .................................................................................................................. 27
System Management Information .............................................................................................................. 28
Configuration of IP Address, Subnet Mask and Gateway Address ............................................................ 30
IP Access List Configuration ...................................................................................................................... 32
Create an IP Access List ..................................................................................................................... 32
Delete an IP Address List Entry........................................................................................................... 33
User Name and Password Configuration................................................................................................... 34
Add New User Name and Password ................................................................................................... 34
Modify User Name and Password ....................................................................................................... 35
Delete User Name and Password ....................................................................................................... 36
User Interface Configuration ...................................................................................................................... 37
SNMP Interface ................................................................................................................................... 37
User Interface Timeout ........................................................................................................................ 38
System Time .............................................................................................................................................. 39
Manually Setting System Time ............................................................................................................ 39
Setting SNTP....................................................................................................................................... 40
Setting Daylight Savings Parameters .................................................................................................. 41
SSL Settings .............................................................................................................................................. 42
Configuring SSL .................................................................................................................................. 42
DHCP and ATI Web Discovery Tool .......................................................................................................... 44
DHCP Client Configuration ........................................................................................................................ 45
DHCP Auto Configuration .......................................................................................................................... 47
System Information Display ....................................................................................................................... 48
System Log Configuration.......................................................................................................................... 50
Bridge Configuration ........................................................................................................................................ 53
Chapter 3: Port Configuration ....................................................................................................................... 55
Overview .................................................................................................................................................... 56
Displaying and Configuring Ports............................................................................................................... 57
Chapter 4: STP and RSTP ............................................................................................................................ 61
Overview .................................................................................................................................................... 62
Bridge Priority and the Root Bridge ..................................................................................................... 63
3
Contents
Forwarding Delay and Topology Changes...........................................................................................65
Mixed STP and RSTP Networks ..........................................................................................................67
Spanning Tree and VLANs .................................................................................................................. 68
Basic STP and RSTP Configuration...........................................................................................................70
Configure RSTP Port Settings .................................................................................................................... 73
Configure the Basic RSTP Port Settings.............................................................................................. 73
Configure the Advanced RSTP Port Settings ......................................................................................75
Spanning Tree Topology ............................................................................................................................ 78
Chapter 5: Multiple Spanning Tree Protocol ................................................................................................. 79
Multiple Spanning Tree Configuration ........................................................................................................80
Port Configuration....................................................................................................................................... 83
VLAN Mapping ...........................................................................................................................................86
Open MSTP VLAN Mapping Page.......................................................................................................86
Create VLAN Mapping to MST Instance ..............................................................................................86
Modify MST Instance ........................................................................................................................... 87
Delete MST Instance............................................................................................................................87
Port Settings ...............................................................................................................................................88
Topology Information.................................................................................................................................. 90
Chapter 6: Static Port Trunking ..................................................................................................................... 93
Overview.....................................................................................................................................................94
Create a Port Trunk .................................................................................................................................... 97
Modify a Port Trunk .................................................................................................................................... 99
Disable a Port Trunk................................................................................................................................. 101
Chapter 7: LACP Port Trunks ......................................................................................................................103
Overview...................................................................................................................................................104
System Priority ......................................................................................................................................... 105
Port Priority Value..................................................................................................................................... 106
General Guidelines................................................................................................................................... 107
Group Status ............................................................................................................................................ 109
Configuration Example.......................................................................................................................110
Port Priority Configuration ........................................................................................................................ 112
Chapter 8: Port Mirroring ............................................................................................................................. 113
Overview...................................................................................................................................................114
Port Mirroring Configuration ..................................................................................................................... 115
Disable Port Mirroring............................................................................................................................... 117
Chapter 9: Loopback Protection .................................................................................................................. 119
Configuration ............................................................................................................................................ 120
Status ....................................................................................................................................................... 122
Chapter 10: MAC Address Table ................................................................................................................ 123
Overview...................................................................................................................................................124
Static Unicast MAC Address Configuration .............................................................................................. 126
Modify Static Unicast Address..................................................................................................................128
Delete Static Unicast Address .................................................................................................................. 129
Static Multicast Address Configuration..................................................................................................... 130
Modify Static Multicast Address................................................................................................................133
Delete Static Multicast Address................................................................................................................134
Chapter 11: IGMP Snooping ....................................................................................................................... 135
Overview...................................................................................................................................................136
IGMP Snooping Configuration..................................................................................................................138
Chapter 12: Storm Control .......................................................................................................................... 141
Overview...................................................................................................................................................142
4
AT-GS950/16PS Switch Web Interface User’s Guide
Ingress Rate Limiting......................................................................................................................... 143
Egress Rate Limiting ......................................................................................................................... 143
Configuration............................................................................................................................................ 144
Ingress Rate Limiting ............................................................................................................................... 146
Egress Rate Limiting ................................................................................................................................ 148
Chapter 13: Virtual LANs ............................................................................................................................ 149
VLAN Overview........................................................................................................................................ 150
Port-based VLAN Overview............................................................................................................... 151
Tagged VLAN Overview .................................................................................................................... 152
General Rules for Creating a Tagged VLAN ..................................................................................... 154
Assign Ports to a VLAN Mode.................................................................................................................. 155
Tagged VLAN Configuration .................................................................................................................... 157
Create a Tagged VLAN ..................................................................................................................... 157
Modify a Tagged VLAN ..................................................................................................................... 158
Delete a Tagged VLAN...................................................................................................................... 160
Tagged VLAN Port Settings ..................................................................................................................... 162
Port-Based VLAN Configuration .............................................................................................................. 164
Create a Port-Based VLAN ............................................................................................................... 164
Modify a Port-Based VLAN................................................................................................................ 165
Chapter 14: GVRP ...................................................................................................................................... 167
Overview and Guidelines ......................................................................................................................... 168
General Configuration .............................................................................................................................. 169
Port Settings............................................................................................................................................. 170
Time Settings ........................................................................................................................................... 172
Chapter 15: Quality of Service and Cost of Service ................................................................................... 175
Overview .................................................................................................................................................. 176
Packet Priority ................................................................................................................................... 176
Egress Queue vs Packet Priority Mapping ........................................................................................ 177
Prioritizing Untagged Packets ........................................................................................................... 178
Scheduling......................................................................................................................................... 178
Mapping CoS Priorities to Egress Queues............................................................................................... 180
Associate Ports to CoS Priorities ............................................................................................................. 182
Associate DSCP Classes to Egress Queues ........................................................................................... 183
Queue Scheduling Algorithm ................................................................................................................... 185
Advanced Features ....................................................................................................................................... 187
Chapter 16: SNMPv1 and v2c .................................................................................................................... 189
SNMPv1 and SNMPv2c Overview ........................................................................................................... 190
Trap Receiver Attributes .......................................................................................................................... 191
Activate SNMP Interface .......................................................................................................................... 192
SNMPv1 and SNMPv2c User and Group Names .................................................................................... 193
Create User and Group Names......................................................................................................... 193
Modify User and Group Names ......................................................................................................... 194
Delete User and Group Names ......................................................................................................... 195
SNMP Community Strings ....................................................................................................................... 196
Create SNMP Community Strings ..................................................................................................... 196
Modify SNMP Community Strings ..................................................................................................... 197
Delete SNMP Community Strings ..................................................................................................... 197
SNMP Traps............................................................................................................................................. 198
Create Trap Host Table Entry............................................................................................................ 198
Modify a Trap Host Table Entry......................................................................................................... 199
Delete a Trap Host Table Entry ......................................................................................................... 199
Chapter 17: SNMPv3 .................................................................................................................................. 201
5
Contents
Overview...................................................................................................................................................202
SNMPv3 Authentication Protocols .....................................................................................................202
SNMPv3 Privacy Protocol .................................................................................................................. 203
SNMPv3 MIB Views ...........................................................................................................................203
SNMPv3 Configuration Process.........................................................................................................204
SNMPv3 User and Group Names ............................................................................................................ 206
Creating SNMPv3 User and Group Names ....................................................................................... 206
Modifying SNMPv3 User and Group Names...................................................................................... 207
Deleting SNMPv3 User and Group Names........................................................................................ 207
SNMPv3 View Names .............................................................................................................................. 209
Creating SNMPv3 View Names ......................................................................................................... 209
Modifying SNMPv3 View Names .......................................................................................................211
Deleting SNMPv3 View Names.......................................................................................................... 211
SNMPv3 View Table................................................................................................................................. 212
Creating SNMPv3 View Table Entries ...............................................................................................212
Modifying SNMPv3 View Table Entries.............................................................................................. 213
Deleting SNMPv3 View Table Entries................................................................................................ 213
SNMPv3 Traps ......................................................................................................................................... 215
Chapter 18: Access Control Configuration ..................................................................................................217
Overview...................................................................................................................................................218
Classifier................................................................................................................................................... 219
Creating a Classifier...........................................................................................................................219
Modifying a Classifier ......................................................................................................................... 221
Deleting a Classifier ........................................................................................................................... 222
Profile Action ............................................................................................................................................224
Creating a Profile Action ....................................................................................................................224
Modifying Profile Action...................................................................................................................... 225
Deleting a Profile Action.....................................................................................................................226
In-Profile Action ........................................................................................................................................ 227
Creating an In-Profile Action ..............................................................................................................227
Modifying an In-Profile Action ............................................................................................................229
Deleting an In-Profile Action...............................................................................................................230
Out-Profile Action ..................................................................................................................................... 231
Creating a Out-Profile Action .............................................................................................................231
Modify Out-Profile Action ...................................................................................................................233
Delete Out-Profile Action....................................................................................................................234
Port List ....................................................................................................................................................235
Create Port List .................................................................................................................................. 235
Modify Port List .................................................................................................................................. 236
Delete Port List...................................................................................................................................237
Policy ........................................................................................................................................................ 238
Create Policy......................................................................................................................................238
Modify Policy ......................................................................................................................................240
Delete Policy ...................................................................................................................................... 241
Policy Sequence Status............................................................................................................................ 243
Chapter 19: RMON .....................................................................................................................................245
Overview...................................................................................................................................................246
Enable and Disable RMON ...................................................................................................................... 247
Port Statistics............................................................................................................................................248
Histories....................................................................................................................................................250
Events.......................................................................................................................................................252
Alarms ...................................................................................................................................................... 254
Chapter 20: Voice VLAN ............................................................................................................................. 257
6
AT-GS950/16PS Switch Web Interface User’s Guide
Overview .................................................................................................................................................. 258
CoS with Voice VLAN........................................................................................................................ 258
Organization Unique Identifier (OUI) ................................................................................................. 258
Dynamic Auto-Detection vs Static Ports ............................................................................................ 259
General Guidelines .................................................................................................................................. 261
Configuration............................................................................................................................................ 262
OUI Setting............................................................................................................................................... 265
Create OUI Setting ............................................................................................................................ 265
Modify OUI Setting ............................................................................................................................ 266
Delete OUI Setting............................................................................................................................. 266
Chapter 21: Security ................................................................................................................................... 267
Port Access Control ................................................................................................................................. 268
Overview............................................................................................................................................ 268
Port Access Control Configuration .................................................................................................... 269
RADIUS Client ......................................................................................................................................... 273
Overview............................................................................................................................................ 273
General Guidelines............................................................................................................................ 273
Radius Client Configuration............................................................................................................... 274
Dial-in User— Local Authentication ......................................................................................................... 276
Overview............................................................................................................................................ 276
Dial-in User Configuration ................................................................................................................. 276
Destination MAC Filter ............................................................................................................................. 279
Overview............................................................................................................................................ 279
Destination MAC Filter Configuration ................................................................................................ 279
Delete Destination MAC Filter ........................................................................................................... 280
Chapter 22: Power Over Ethernet (PoE) .................................................................................................... 283
Overview .................................................................................................................................................. 284
Power Sourcing Equipment (PSE) .................................................................................................... 284
Powered Device (PD) ........................................................................................................................ 284
PD Classes........................................................................................................................................ 284
Power Budget .................................................................................................................................... 284
Port Prioritization ............................................................................................................................... 285
PoE Configuration .................................................................................................................................... 286
Chapter 23: Chapter 23: DHCP Snooping ............................................................................................... 290
Overview .................................................................................................................................................. 291
Trusted Ports ..................................................................................................................................... 291
Untrusted Ports.................................................................................................................................. 291
Unauthorized DHCP Servers............................................................................................................. 291
DHCP with Option 82 ........................................................................................................................ 292
General Guidelines .................................................................................................................................. 293
General Configuration .............................................................................................................................. 294
VLAN Setting............................................................................................................................................ 296
Creating a VLAN................................................................................................................................ 296
Modifying a VLAN.............................................................................................................................. 297
Deleting a VLAN ................................................................................................................................ 297
Trusted and Untrusted Port Configuration ............................................................................................... 298
Binding Database..................................................................................................................................... 300
Static IP Addresses ........................................................................................................................... 300
Viewing .............................................................................................................................................. 301
Chapter 24: LLDP ....................................................................................................................................... 303
Overview .................................................................................................................................................. 304
Global Configuration ................................................................................................................................ 305
Enabling or Disabling LLDP............................................................................................................... 306
7
Contents
Displaying System Information........................................................................................................... 307
Setting Port States .............................................................................................................................307
Neighbors Information .............................................................................................................................. 309
Chapter 25: Network Statistics .................................................................................................................... 311
Overview...................................................................................................................................................312
Traffic Comparison Statistics.................................................................................................................... 313
Error Group Statistics ...............................................................................................................................316
Historical Status Charts ............................................................................................................................ 318
Tools .............................................................................................................................................................. 321
Chapter 26: Software/Configuration Updates .............................................................................................323
Overview...................................................................................................................................................324
Upgrade Firmware Image via HTTP.........................................................................................................325
Upgrade Firmware Image via TFTP ......................................................................................................... 327
Upload or Download a Configuration File via HTTP.................................................................................329
Configuration File Upload................................................................................................................... 329
Configuration File Download ..............................................................................................................331
Download or Upload a Configuration File via TFTP .................................................................................332
Configuration File Upload................................................................................................................... 332
Configuration File Download ..............................................................................................................333
Chapter 27: Cable Diagnostics ................................................................................................................... 335
Chapter 28: Rebooting the AT-GS950/16PS .............................................................................................. 337
Switch Reboot ..........................................................................................................................................338
Configure Factory Default Values............................................................................................................. 340
Password Protection of Factory Reset ..................................................................................................... 342
Disabling Factory Default Reset Feature ........................................................................................... 342
Enabling Factory Default Reset .........................................................................................................344
Chapter 29: Pinging a Remote System .......................................................................................................347
Appendix A: MSTP Overview ....................................................................................................................... 349
Overview...................................................................................................................................................350
Multiple Spanning Tree Instance (MSTI) ..................................................................................................352
Resolving VLAN Fragmentation.........................................................................................................352
Multiple VLANs Assigned to an MSTI ................................................................................................ 353
General Guidelines................................................................................................................................... 355
VLAN and MSTI Associations .................................................................................................................. 356
Ports in Multiple MSTIs............................................................................................................................. 357
Multiple Spanning Tree Regions .............................................................................................................. 358
MST Region Guidelines ..................................................................................................................... 360
Common and Internal Spanning Tree (CIST) .................................................................................... 362
MSTP with STP and RSTP ................................................................................................................362
Associating VLANs to MSTIs....................................................................................................................363
VLANs Across Different Regions..............................................................................................................365
Summary of Guidelines ............................................................................................................................ 367
Appendix B: AT-GS950/16PS Default Parameters ...................................................................................... 369
8
List of Figures
Figure 1. Entering a Switch’s IP Address in the URL Field................................................................................................ 22
Figure 2. Management Login Dialog Box .......................................................................................................................... 22
Figure 3. AT-GS950/16PS Switch Information Page......................................................................................................... 23
Figure 4. Front Panel Page ............................................................................................................................................... 24
Figure 5. AT-GS950/16PS Management Page ................................................................................................................. 28
Figure 6. IP Setup Page .................................................................................................................................................... 30
Figure 7. IP Access List Page ........................................................................................................................................... 32
Figure 8. Administration Page ........................................................................................................................................... 34
Figure 9. Modify Administration Page................................................................................................................................ 35
Figure 10. User Interface Page ......................................................................................................................................... 37
Figure 11. System Time Page ........................................................................................................................................... 39
Figure 12. SSL Settings Page ........................................................................................................................................... 42
Figure 13. DHCP Auto Configuration Settings Page ......................................................................................................... 47
Figure 14. AT-GS950/16PS Switch Information Page....................................................................................................... 48
Figure 15. System Log Configuration Page....................................................................................................................... 50
Figure 16. AT-GS950/16PS Physical Interface Page ........................................................................................................ 57
Figure 17. Point-to-Point Ports .......................................................................................................................................... 67
Figure 18. Edge Port ......................................................................................................................................................... 67
Figure 19. STP and VLAN Fragmentation with Untagged Ports........................................................................................ 68
Figure 20. STP and VLAN Compatibility with Tagged Ports.............................................................................................. 69
Figure 21. Rapid Spanning Tree Configuration Page........................................................................................................ 70
Figure 22. AT-GS950/16PS RSTP Basic Port Configuration Page ................................................................................... 73
Figure 23. AT-GS950/16PS RSTP Advanced Port Configuration Page............................................................................ 75
Figure 24. AT-GS950/16PS Designated Topology Information Page ............................................................................... 78
Figure 25. Multiple Spanning Tree Configuration Page..................................................................................................... 80
Figure 26. AT-GS950/16PS MSTP Port Configuration Page ............................................................................................ 83
Figure 27. MSTP VLAN Mapping Page ............................................................................................................................. 86
Figure 28. MSTP Port Settings Page............................................................................................
Figure 29. AT-GS950/16PS Topology Information Page................................................................................................... 90
Figure 30. Static Port Trunk Example................................................................................................................................ 94
Figure 31. Trunking Page .................................................................................................................................................. 97
Figure 32. LACP Group Status Page .............................................................................................................................. 109
Figure 33. LACP Group Status Page with No Cables Connected ................................................................................... 110
Figure 34. LACP Group Status Page with Three Cables Connected .............................................................................. 111
Figure 35. AT-GS950/16PS Port Priority Page................................................................................................................ 112
Figure 36. AT-GS950/16PS Mirroring Page .................................................................................................................... 115
Figure 37. AT-GS950/16PS Loopback Detection Page................................................................................................... 120
Figure 38. AT-GS950/16PS Static Unicast Address Table Page.................................................................................... 126
Figure 39. Static Unicast Address Table with Port-Base VLAN Example........................................................................ 127
Figure 40. Modify Static Unicast Address Page .............................................................................................................. 128
Figure 41. AT-GS950/16PS Static Multicast Address Table Page .................................................................................. 130
Figure 42. Static Multicast Address Table Example ........................................................................................................ 131
Figure 43. Modify Static Multicast Address Page ............................................................................................................ 133
Figure 44. IGMP Snooping Page..................................................................................................................................... 138
Figure 45. IGMP Snooping Page with MAC Addresses .................................................................................................. 139
Figure 46. AT-GS950/16PS Storm Control Page ............................................................................................................ 144
Figure 47. AT-GS950/16PS Ingress Rate Limiting Page................................................................................................. 146
Figure 48. AT-GS950/16PS Egress Rate Limiting Page ................................................................................................. 148
Figure 49. AT-GS950/16PS VLAN Mode Page............................................................................................................... 155
Figure 50. AT-GS950/16PS Tagged VLAN Page............................................................................................................ 157
..................................... 88
9
Figures
Figure 51. Example of AT-GS950/16PS Tagged VLAN Page ......................................................................................... 159
Figure 52. AT-GS950/16PS Modify VLAN Page.............................................................................................................. 159
Figure 53. AT-GS950/16PS VLAN Port Setting Page ..................................................................................................... 162
Figure 54. Port-Based VLAN Page.................................................................................................................................. 164
Figure 55. Example of AT-GS950/16PS Port Based VLAN Page ................................................................................... 165
Figure 56. GVRP Global Configuration Page .................................................................................................................. 169
Figure 57. GVRP Port Setting Page ................................................................................................................................ 170
Figure 58. AT-GS950/16PS GVRP Time Setting Page ................................................................................................... 172
Figure 59. CoS Page ....................................................................................................................................................... 180
Figure 60. AT-GS950/16PS Port Priority Page................................................................................................................ 182
Figure 61. DSCP Class Mapping Page............................................................................................................................ 183
Figure 62. Scheduling Algorithm Page ............................................................................................................................ 185
Figure 63. SNMP User/Group Page ................................................................................................................................ 193
Figure 64. SNMP User/Group Page Example ................................................................................................................. 194
Figure 65. Community Table Page .................................................................................................................................. 196
Figure 66. SNMP Community Table Page Example........................................................................................................ 197
Figure 67. Trap Management Page................................................................................................................................. 198
Figure 68. Trap Management Page Example.................................................................................................................. 199
Figure 69. MIB Tree......................................................................................................................................................... 203
Figure 70. SNMPv3 Table Relationships......................................................................................................................... 205
Figure 71. SNMP User Group, SNMPv3 Example........................................................................................................... 207
Figure 72. SNMP Group Access Table............................................................................................................................ 209
Figure 73. SNMP Group Access Table Example for SNMPv3 ........................................................................................210
Figure 74. SNMP View Table........................................................................................................................................... 212
Figure 75. SNMP View Table Page Example .................................................................................................................. 213
Figure 76. Create Classifier Page.................................................................................................................................... 219
Figure 77. Create Classifier Example Page..................................................................................................................... 221
Figure 78. Modify Classifier Page.................................................................................................................................... 222
Figure 79. Create Profile Action Page ............................................................................................................................. 224
Figure 80. Example of Profile Action Entry ...................................................................................................................... 225
Figure 81. Modify Profile Action Page.............................................................................................................................. 226
Figure 82. Create In-Profile Action Page Example .......................................................................................................... 227
Figure 83. Example of In-Profile Action Entry .................................................................................................................. 228
Figure 84. Modify In-Profile Action Page ......................................................................................................................... 229
Figure 85. Create Out-Profile Action Page .....................................................................................
Figure 86. Example of Out-Profile Action Entry ............................................................................................................... 232
Figure 87. Modify Out-Profile Action Page....................................................................................................................... 233
Figure 88. Create Port List Page ..................................................................................................................................... 235
Figure 89. Example of Port List Entry .............................................................................................................................. 236
Figure 90. Modify Port List Page...................................................................................................................................... 236
Figure 91. Create Policy Page......................................................................................................................................... 238
Figure 92. Example of Policy Entry.................................................................................................................................. 240
Figure 93. Modify Policy Page ......................................................................................................................................... 241
Figure 94. Policy Sequence Page.................................................................................................................................... 243
Figure 95. Policy Sequence Page with Display by Index Selected.................................................................................. 243
Figure 96. RMON Basic Settings Page............................................................................................................................ 247
Figure 97. Ethernet Statistics Configuration Page........................................................................................................... 248
Figure 98. Ethernet Statistics Configuration Example ..................................................................................................... 249
Figure 99. History Control Configuration Page ................................................................................................................ 250
Figure 100. History Control Configuration Example Page ............................................................................................... 251
Figure 101. RMON Event Configuration Page................................................................................................................. 252
Figure 102. RMON Event Configuration Example Page.................................................................................................. 253
Figure 103. RMON Alarm Configuration Page................................................................................................................. 255
Figure 104. RMON Alarm Configuration Example Page (To be provided) ...................................................................... 256
Figure 105. AT-GS950/16PS Voice VLAN Setting Page ................................................................................................. 262
Figure 106. Voice VLAN OUI Setting Page. .................................................................................................................... 265
Figure 107. Port Access Control Configuration Page ...................................................................................................... 269
Figure 108. Expanded Port Access Control Configuration Page ..................................................................................... 270
Figure 109. RADIUS Page...............................................................................................................................................274
Figure 110. Dial-In User Page ......................................................................................................................................... 277
.................................231
10
AT-GS950/16PS Switch Web Interface User’s Guide
Figure 111. Dial-In User Page Example .......................................................................................................................... 277
Figure 112. Destination MAC Filter Page ........................................................................................................................ 280
Figure 113. Destination MAC Filter Page Example ......................................................................................................... 280
Figure 114. Power Over Ethernet Configuration Page .................................................................................................... 286
Figure 115. General Settings Page ................................................................................................................................. 294
Figure 116. DHCP Snooping VLAN Settings Page. ........................................................................................................ 296
Figure 117. AT-GS950/16PS Trusted Interfaces Page ................................................................................................... 298
Figure 118. Trusted Interfaces Page Example ................................................................................................................ 299
Figure 119. AT-GS950/16PS Binding Database Page .................................................................................................... 300
Figure 120. Binding Database Page Example................................................................................................................. 301
Figure 121. AT-GS950/16PS LLDP Global Settings Page .............................................................................................. 305
Figure 122. LLDP Neighbors Information Page............................................................................................................... 309
Figure 123. Traffic Comparison Page.............................................................................................................................. 313
Figure 124. Error Group Chart Page ............................................................................................................................... 316
Figure 125. Historical Status Chart Page ........................................................................................................................ 318
Figure 126. Firmware Upgrade via HTTP Page .............................................................................................................. 326
Figure 127. Firmware Upgrade via TFTP Page............................................................................................................... 328
Figure 128. Configuration File Upload/Download via HTTP Page................................................................................... 329
Figure 129. Result Page.................................................................................................................................................. 330
Figure 130. File Download with HTTP............................................................................................................................. 331
Figure 131. Configuration Upload/Download via TFTP Page.......................................................................................... 332
Figure 132. Cable Diagnostics Page ............................................................................................................................... 335
Figure 133. Factory Default Reset/Reboot Page.................................................................................
Figure 134. Factory Default Reset/Reboot Page with Password Entry ........................................................................... 343
Figure 135. Factory Default Reset Disabled Page .......................................................................................................... 344
Figure 136. Factory Default Reset/Reboot Page with Password Entry ........................................................................... 345
Figure 137. Ping Test Configuration Page....................................................................................................................... 347
Figure 138. Ping Test Results Page................................................................................................................................ 348
Figure 139. VLAN Fragmentation with STP or RSTP...................................................................................................... 352
Figure 140. MSTP Example of Two Spanning Tree Instances ....................................................................................... 353
Figure 141. Multiple VLANs in a MSTI............................................................................................................................. 354
Figure 142. CIST and VLAN Guideline - Example 1........................................................................................................ 363
Figure 143. CIST and VLAN Guideline - Example 2........................................................................................................ 364
Figure 144. Spanning Regions - Example 1 .................................................................................................................... 365
Figure 145. Spanning Regions without Blocking ............................................................................................................. 366
............................ 338
11
Figures
12
List of Tables
Table 1. Bridge Priority Value Increments ...................................................................................... 63
Table 2. Valid Port Priority Values .................................................................................................. 65
Table 3. Default Mappings Priority Levels to Priority Queues ...................................................... 177
Table 4. Customized Mappings Priority Levels to Priority Queues ............................................... 177
Table 5. Example of Weighted Round Robin Priority .................................................................... 179
Table 6. IEEE Powered Device Classes ....................................................................................... 284
Table 7. PoE Port Priorities ........................................................................................................... 285
Table 8. Traffic Comparison Options ............................................................................................ 314
Table 9. Historical Status Options ................................................................................................. 319
Table 10. MSTP Region ................................................................................................................ 359
Table 11. Regional Bridge Priority Value Increments ................................................................... 360
Table 12. AT-S112 Management Software Default Settings ........................................................ 369
13
List of Tables
14
Preface
This guide contains instructions on how to use the AT-S112 Management
Software to manage and monitor the AT-GS950/16PS Gigabit Ethernet
PoE+ Switch.
The AT-S112 Management software has a web browser interface that you
can access from any management workstation on your network that has a
web browser application.
This preface contains the following sections:
“Document Conventions” on page 16
“Allied Telesis Contact Information” on page 17
15
Preface
Note
Caution
Warning
Document Conventions
This document uses the following conventions:
Notes provide additional information.
Cautions inform you that performing or omitting a specific action
may result in equipment damage or loss of data.
Warnings inform you that performing or omitting a specific action
may result in bodily injury.
16
AT-GS950/16PS Switch Web Interface User’s Guide
Allied Telesis Contact Information
If you need assistance with this product, you may contact Allied Telesis
technical support by going to the Support & Services section of the Allied
Telesis web site at www.alliedtelesis.com/support. You can find links for
the following services on this page:
24/7 Online Support - Enter our interactive support
center to search for answers to your questions in our
knowledge database, check support tickets, learn
about RMAs, and contact Allied Telesis technical
experts.
USA and EMEA phone support - Select the phone
number that best fits your location and customer type.
Hardware warranty information - Learn about Allied
Telesis warranties and register your product online.
Replacement Services - Submit a Return Merchandise
Authorization (RMA) request via our interactive support
center.
Documentation - View the most recent installation
guides, user guides, software release notes, white
papers and data sheets for your product.
Software Updates - Download the latest software
releases for your product.
For sales or corporate contact information, go to
www.alliedtelesis.com/purchase and select your region.
17
Preface
18
Section I
Getting Started
This section contains the following chapters:
Chapter 1, “Starting a Web Browser Session” on page 21
Chapter 2, “System Configuration” on page 27
19
20
Chapter 1
Starting a Web Browser Session
This chapter contains the procedures for starting, using, and quitting a web
browser management session on the AT-GS950/16PS switch. This
chapter includes the following sections:
“Establishing a Remote Connection to the Web Browser Interface” on
page 22
“Web Browser Tools” on page 25
“Quitting a Web Browser Management Session” on page 26
21
Chapter 1: Starting a Web Browser Session
Switch’s IP Address
Establishing a Remote Connection to the Web Browser Interface
The AT-GS950/16PS switch is shipped with a pre-assigned IP address of
192.168.1.1. After your initial login, Allied Telesis suggests that you assign
a new IP address to your switch. To manually assign an IP address to the
switch, refer to “Configuration of IP Address, Subnet Mask and Gateway
Address” on page 30. To configure the switch to obtain its IP configuration
from a DHCP server, refer to “DHCP Client Configuration” on page 45.
Whether you use the pre-assigned IP address or assign a new one, you
must set your local PC to the same subnet as the switch.
To start a web browser management session, perform the following
procedure:
1. Start your web browser.
2. In the URL field of the browser, enter 192.168.1.1.
This is the default IP address of the switch. See Figure 1.
Figure 1. Entering a Switch’s IP Address in the URL Field
The AT-S112 Management Software displays the login dialog box. See
Figure 2.
22
Figure 2. Management Login Dialog Box
3. Enter the AT-S112 management login user name and password.
AT-GS950/16PS Switch Web Interface User’s Guide
Note
The default user name is “manager” and the default password is
“friend.” The login name and password are case-sensitive.
4. Press OK.
The AT-GS950/16PS Switch Information page is displayed. See Figure
3.
To change the user name and password, refer to “User Name and
Password Configuration” on page 34.
Figure 3. AT-GS950/16PS Switch Information Page
The main menu appears on the left side and is common for all of the
management pages discussed in this manual. It consists of the following
folders and web pages:
Switch Info
Front Panel
System
Physical Interface
Bridge
SNMP
Access Control
RMON
23
Chapter 1: Starting a Web Browser Session
5. To see the front panel of the switch, select Front Panel from the main
Voice VLAN
Security
LLDP
Statistics Chart
Tools
Save Configuration
menu on the left side of the page.
The AT-S112 Management software displays the front of the switch.
Ports are green that have a link to an end node. Ports without a link
are grey. The AT-GS950/16PS switch front panel page is shown in
Figure 4.
Figure 4. Front Panel Page
A web browser management session remains active even if you link to
other sites. You can return to the management web pages anytime as long
as you do not quit your browser session or the management session does
not time out. The default time-out is 10 minutes.
24
Web Browser Tools
You can use the web browser tools to move around the management
pages. Selecting Back on your browser’s toolbar returns you to the
previous display. You can also use the browser’s Bookmark feature to
save the link to the switch.
AT-GS950/16PS Switch Web Interface User’s Guide
25
Chapter 1: Starting a Web Browser Session
Quitting a Web Browser Management Session
To exit a web browser management session, close the web browser.
26
Chapter 2
Note
System Configuration
This chapter provides procedures to configuring basic system parameters
for the AT-GS950/16PS switch and contains information for the following
sections:
“System Management Information” on page 28
“Configuration of IP Address, Subnet Mask and Gateway Address” on
page 30
“IP Access List Configuration” on page 32
“User Name and Password Configuration” on page 34
“User Interface Configuration” on page 37
“System Time” on page 39
“SSL Settings” on page 42
“DHCP and ATI Web Discovery Tool” on page 44
“DHCP Client Configuration” on page 45
“DHCP Auto Configuration” on page 47
“System Log Configuration” on page 50
“System Information Display” on page 48
To permanently save your new settings or any changes to the
configuration file, select Save Configuration to Flash from the main
menu on the left side of the page.
27
Chapter 2: System Configuration
Note
System Management Information
This section explains how to assign a name, location, and contact
information for the AT-GS950/16PS switch. This information helps in
identifying each specific AT-GS950/16PS switch among other switches in
the same local area network. Entering this information is optional.
Allied Telesis recommends that you assign a name to the switch.
Naming each switch can help you identify the specific switch you
want to manage among others. It can also help to avoid performing
a configuration procedure on the wrong switch.
To set a switch’s administration information, perform the following
procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select Management.
The Management Page is displayed. See Figure 5 for the
AT-GS950/16PS Management Page.
Figure 5. AT-GS950/16PS Management Page
3. Configure the following parameters as necessary:
System Description - Specifies the Allied Telesis switch model.
You cannot change this parameter.
System Object ID - Indicates the unique SNMP MIB object
identifier that identifies the switch model. You cannot change this
parameter.
28
AT-GS950/16PS Switch Web Interface User’s Guide
System Name - Specifies a name for the switch, for example,
Sales. The name is optional and may contain up to 15 characters.
System Location - Specifies the location of the switch. The
location is optional and may contain up to 30 characters.
System Contact - Specifies the name of the network administrator
responsible for managing the switch. This contact name is optional
and may contain up to 30 characters.
4. Click Apply.
5. From the main menu on the left side of the page, click on Switch Info.
The Switch Information page is displayed. See “AT-GS950/8 Switch
Information Page” on page 21 for more information.
6. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
29
Chapter 2: System Configuration
Configuration of IP Address, Subnet Mask and Gateway Address
This procedure explains how to change the IP address, subnet mask, and
gateway address of the switch. Before performing the procedure, note the
following:
A gateway address is only required if you want to
remotely manage the device from a management
station that is separated from the switch by a router.
To configure the switch to automatically obtain its IP
configuration from a DHCP server on your network, go
to “DHCP Client Configuration” on page 45.
To change the switch’s IP configuration, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select IP Setup.
The IP Setup Page is displayed. See Figure 6.
Figure 6. IP Setup Page
3. Change the IP configuration parameters by observing or entering new
information in the following fields:
System MAC Address - This parameter displays the MAC
address of the switch. You cannot change this parameter.
System IP Address - Displays the current IP address of the
switch. To change the IP address, enter a new IP address.
When DHCP is enabled, you cannot change this parameter.
30
System Subnet Mask - Displays the current subnet mask of the
switch. To change the subnet mask, enter a new subnet mask.
When DHCP is enabled, you cannot change this parameter.
AT-GS950/16PS Switch Web Interface User’s Guide
Note
Caution
System Default Gateway - Displays the default gateway of the
switch. To change the default gateway, enter a new gateway.
When DHCP is enabled, you cannot change this parameter.
DHCP Mode - For information about setting this parameter, refer to
“DHCP Client Configuration” on page 45.
4. Click Apply.
Changing the IP address ends your management session. To
resume managing the device, enter the new IP address of the switch
in the web browser’s URL field, as shown in Figure 1 on page 20.
5. After you log on to the switch with the new IP address, select Save
Configuration to Flash from the main menu on the left side of the
page to save the new IP address to memory.
If you do not select Save Configuration to Flash, the IP address
will revert to its original setting when you power cycle or reboot the
switch.
31
Chapter 2: System Configuration
Note
Note
IP Access List Configuration
When the IP Access List feature is enabled, remote access to the
AT-S112 management software is restricted to the IP addresses entered
into the IP Access List.
The procedures in this section describe how to enable or disable the IP
Access List feature and how to add or remove IP addresses from the list.
See the following sections:
“Create an IP Access List” on page 32
“Delete an IP Address List Entry” on page 33
To modify IP address that has already been created, it must first be
deleted and them re-created using the following procedures.
Create an IP
Access List
To create a list of accessible IP addresses, perform the following
procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select IP Access List. The IP Access List
Page is displayed. See Figure 7.
.
Figure 7. IP Access List Page
3. Enter an IP address in the IP Address field using a xxx.xxx.xxx.xxx
format.
4. Click Add.
The IP address is added to the IP Access List table in the Accessible
IP column.
You can add up to 10 IP address to the IP Access List table.
32
AT-GS950/16PS Switch Web Interface User’s Guide
5. From the IP Restriction Status field, select one of the following
choices from the pull-down menu:
Enable - This selection restricts the access to the AT-S112
management software to the IP addresses in the table listed under
Accessible IP.
Disable - This selection allows unrestricted access to the AT-S112
management software.
6. Click Apply.
Access to the management software is now restricted to those IP
addresses listed in the IP Access List table.
7. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
Delete an IP
Address List
Entry
To delete an IP address from the IP Access List, perform the following
procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select IP Access List.
The IP Access List Page is displayed. See Figure 7 on page 32.
3. Select Delete next to the IP address that you want to remove.
The IP address is removed from the IP Access List table. If you
remove the last IP address from the table, the IP Restriction Status
field is set to Disable.
4. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
33
Chapter 2: System Configuration
User Name and Password Configuration
Password protection is always enabled for access to the AT-S112
Management software. This section explains how to create new users
names and passwords and how to modify or delete existing users for the
web interface. See the following sections:
“Add New User Name and Password” on page 34
“Modify User Name and Password” on page 35
“Delete User Name and Password” on page 36
Add New User
Name and
Password
The default User Name and Password is “manager” and “friend” - both
without the quotes. To configure new User Name and Password
information, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select Administration.
The Administration Page is displayed. See Figure 8.
Figure 8. Administration Page
34
3. To create a user name, enter a user name in the box next to the User
Name field.
You can enter a value of up to 12 alphanumeric characters. The User
Name field is case sensitive.
AT-GS950/16PS Switch Web Interface User’s Guide
Note
4. To add a password that corresponds to the user name entered in
step 3, enter a password of up to 12 alphanumeric characters in the
box next to the Password field. The Password field is case sensitive.
5. To confirm the password entry, retype the password in the box next to
the Confirm Password field.
6. Click Add to activate your changes on the switch.
7. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
Modify User
Name and
Password
To modify the a user name password, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select Administration.
The Administration Page is shown in Figure 8 on page 34.
3. Identify the user name that you want to change and click Modify in the
Action column.
The Modify Administration Page is displayed. See Figure 9.
The default user name cannot be modified or deleted. The default
password can be modified.
Figure 9. Modify Administration Page
4. To change a password, enter a password of up to 12 alphanumeric
characters in the box next to the Password field.
5. To confirm the above password, retype the password in the box next to
the Confirm Password field.
6. Click Apply to activate your changes on the switch.
7. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
35
Chapter 2: System Configuration
Note
Delete User Name
and Password
To delete a user name that you have previously added, perform the
following procedure.
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select Administration.
The Administration Page is shown in Figure 8 on page 34.
3. Identify the user name that you want to delete and click Delete.
The user name is removed from the Administration table.
The default user name cannot be modified or deleted. The default
password can be modified.
4. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
36
AT-GS950/16PS Switch Web Interface User’s Guide
Note
User Interface Configuration
This procedure explains how to enable and disable the user interfaces on
the switch. With this procedure you can enable or disable the AT-GS950/
16PS SNMP Agent. For more information about SNMP, go to Chapter 20,
“Simple Network Management Protocol SNMPv1 and v2c” on page 263
and Chapter 21, “Simple Network Management Protocol SNMPv3” on
page 273.
The Web Server Status is displayed as Enabled for your
information only. The Web Server cannot be disabled.
SNMP Interface To enable or disable the AT-GS950/16PS SNMP interface, perform the
following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select User Interface.
The User Interface Page is displayed. See Figure 10.
Figure 10. User Interface Page
3. Choose Enable or Disable from the pull down list for the SNMP Agent
parameter.
Enabled - When you enable this parameter, the SNMP agent is
active. You can manage the AT-GS950/16PS switch with Network
Management Software and the switch’s private MIB.
Disabled - When you enable this parameter, the SNMP agent is
inactive.
37
Chapter 2: System Configuration
Note
See Chapter 20, “Simple Network Management Protocol SNMPv1
and v2c” on page 263 and Chapter 21, “Simple Network
Management Protocol SNMPv3” on page 273 to configure the
remaining SNMP parameters.
4. Click Apply located under the Web Server Status Enable/Disable
field.
5. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
User Interface
Timeout
To set the Web Idle Timeout, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select User Interface.
The User Interface Page is displayed. See Figure 10 on page 37.
3. Refer to the bottom portion of the web page. Enter the Web Idle
Timeout parameter. The range is from 3 to 60 minutes.
4. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
38
System Time
AT-GS950/16PS Switch Web Interface User’s Guide
The procedures in this section describe how to configure the system time
by manually entering the time or through SNTP and how to configure the
daylight savings time feature. See the following sections:
“Manually Setting System Time” on page 39
“Setting SNTP” on page 40
“Setting Daylight Savings Parameters” on page 41
Manually Setting
System Time
To set the system time manually, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select System Time.
The System Time Page is displayed. See Figure 11.
Figure 11. System Time Page
3. Use the pull down menu to set the Clock Mode parameter to
Local time.
39
Chapter 2: System Configuration
4. In the Local Time Settings section, set the Date Setting
(YYYY:MM:DD) to the current date in the YYYY:MM:DD format.
5. In the Local Time Settings section, set the Time Settings
(HH:MM:SS) to the current time in the HH:MM:SS format.
6. Click the Apply button at the bottom of the page.
The time will take effect immediately.
7. Save your new settings or any changes to the configuration file by
selecting Save Configuration to Flash from the main menu on the left
side of the page.
Setting SNTP To configure SNTP, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select System Time.
The System Time Page is displayed. See Figure 11 on page 39.
3. Use the pull down menu to set the Clock Mode parameter to SNTP.
4. Enter the IP address of the SNTP Primary Server. The format is
xxx.xxx.xxx.xxx.
5. Enter the IP address of the SNTP Secondary Server. The format is
xxx.xxx.xxx.xxx.
6. Enter the SNTP Poll Interval. The range is 1 - 60 minutes.
7. Enter the local Time Zone from the pull down menu.
8. Click the Apply button at the bottom of the page.
The switch will immediately start polling the SNTP primary server for
time information.
9. Save your new settings or any changes to the configuration file by
selecting Save Configuration to Flash from the main menu on the left
side of the page.
40
AT-GS950/16PS Switch Web Interface User’s Guide
Setting Daylight
Savings
Parameters
If you want to configure the switch for daylight savings time, perform the
following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select System Time.
The System Time Page is displayed. See Figure 11 on page 39.
3. In the Daylight Savings Time Status field, select Enabled.
4. Specify the Month, Day, Hour and Minute when Daylight Savings will
take effect in the From time fields.
5. Specify the Month, Day, Hour and Minute when Daylight Savings will
end in the To time fields.
6. Using the pull down menu, specify the Daylight Savings offset in the
DST Offset field. You can select either 1 hr or 1/2 hr.
7. Save your new settings or any changes to the configuration file by
selecting Save Configuration to Flash from the main menu on the left
side of the page.
41
Chapter 2: System Configuration
SSL Settings
The AT-GS950/16PS switch has a web browser server for remote
management of the unit with a web browser application from management
workstations on your network. By default, the server operates in a
non-secure HTTP mode and can be configured to communicate in a
secure HTTPS mode with SSL protocol.
In many situations, the communication with the switch will be in a
controlled environment and it is acceptable to communicate with the
management software in the HTTP mode.
However, you may find that your management communications are
subject to outside security risks and web sessions conducted in the nonsecure HTTP mode are vulnerable to security issues because the packets
are sent in clear text. Web browser management sessions that use the
secure HTTPS mode with SSL protocol are protected against snooping
because the packets exchanged between the switch and your
management workstations are encrypted. When operating in this mode,
only the AT-GS950/16PS switch and the web browser are able to decipher
the packets sent and received between them.
Configuring SSL To enable or disable the SSL protocol feature, perform the following
procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select SSL Settings.
The SSL Settings Page is displayed. See Figure 12.
Figure 12. SSL Settings Page
3. From the SSL Settings field, select one of the following choices from
the pull-down menu:
Enable - The secure SSL mode is active. You must log in to the
switch’s management using the HTTPS mode on your browser.
42
Disable - The secure SSL mode is inactive. You must log in to the
switch’s management using the HTTP mode on your browser.
AT-GS950/16PS Switch Web Interface User’s Guide
4. Click Apply.
The SSL setting that you have selected is now active.
5. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
43
Chapter 2: System Configuration
Note
Note
DHCP and ATI Web Discovery Tool
The AT-GS950/16PS Gigabit Ethernet Smart switch is managed through a
web browser interface only. The factory default IP address is 192.168.1.1.
The switch does not have a local console connector, which means that
you cannot learn what the switch’s management IP address is on a web
browser without first knowing what the address is. Once the IP address is
known, you can enter it in the browser.
When the DHCP feature is enabled, a DHCP server automatically assigns
an IP address which is not advertised over the network. As a
consequence, you do not know what IP address has been assigned to the
switch.
The new IP address assignment from the DHCP server may take
one to two minutes before the process is completed.
Fortunately, there is an ATI Web Discovery Tool available that resolves
this issue. It detects the MAC address, IP address and other information of
the AT-GS950 series switches that are present on your local area
network.
The ATI Web Discovery Tool is available for download on the ATGS950/16PS product page at alliedtelesis.com.
44
DHCP Client Configuration
Caution
This procedure explains how to activate and deactivate the DHCP client
on the AT-GS950/16PS switch. When the client is activated, the switch
obtains its IP configuration including an IP address and subnet mask from
a DHCP server on your network. Before performing the procedure, note
the following:
By default, the DHCP client is disabled on the switch.
The DHCP client supports DHCP Auto Configuration
Settings or BOOTP. See “DHCP Auto Configuration”
on page 47 for more information.
After you enable DHCP, your current management
session ends because a different IP address is
assigned to the switch by the DHCP server. The new
IP address can be discovered using the ATI Discovery
Tool. See “DHCP and ATI Web Discovery Tool” on
page 44 for more information.
AT-GS950/16PS Switch Web Interface User’s Guide
To activate or deactivate the DHCP client on the switch, perform the
following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select IP Setup.
The IP Setup Page is shown in Figure 6 on page 30.
3. From the pull-down menu next to the DHCP Mode field, select Enable
or Disable.
4. Click Apply.
When the DHCP client is Enabled, the web server connection to the
switch is lost because a different IP address is assigned to the switch
by the DHCP server.
Enabling DHCP may end your current management session.
5. Use the ATI Web Discovery Tool to find the new IP address assigned
to the switch by the DHCP server. See “DHCP and ATI Web Discovery
Tool” on page 44 for more information.
45
Chapter 2: System Configuration
Note
The ATI Web Discovery Tool is available for download on the ATGS950/16PS product page at alliedtelesis.com.
6. Follow the procedure to log on with the new IP address provided by
the DHCP Server as described in “Establishing a Remote Connection
to the Web Browser Interface” on page 20.
7. Save your new settings or any changes to the configuration file by
selecting Save Configuration to Flash from the main menu on the left
side of the page.
If you do not save the new configuration when DHCP is enabled, the
software reverts to the previously saved IP address value when the
switch is power cycled or rebooted. If no IP address has been
previously saved, the IP address value reverts to 192.168.1.1.
If you enable DHCP and then save your configuration, you are saving
the DHCP setting (Enabled). The next time the switch boots up, it will
use the DHCP process to establish the IP address used to manage the
AT-GS950/16PS switch.
If you enter a new IP address after disabling DHCP and save your
configuration, the DHCP setting (Disabled) and the new IP address on
the switch is saved. The next time the switch boots up, it will respond
to the IP address that you entered when you re-establish contact with
the AT-S112 Management software.
46
DHCP Auto Configuration
Note
Note
If you need to automatically update the switch’s configuration files via a
remote server, the DHCP Auto Configuration feature is available for this
purpose via the DHCP server.
You must enable the DHCP client so that this feature can operate
with the DHCP server. See “DHCP Client Configuration” on page 45
for more information.
To configure this feature on the switch, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select System.
The DHCP Auto Configuration Settings Page is shown in Figure 13.
AT-GS950/16PS Switch Web Interface User’s Guide
Figure 13. DHCP Auto Configuration Settings Page
3. From the Auto Configuration State field, select one of the following
choices from the pull-down menu:
Enable - The DHCP Auto Configuration feature is active.
You must enable the DHCP client so that this feature can operate
with the DHCP server. See “DHCP Client Configuration” on page 45
for more information.
Disable - The DHCP Auto Configuration feature is inactive.
4. Click Apply.
The DHCP Auto Configuration setting that you have selected is now
active.
5. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
47
Chapter 2: System Configuration
System Information Display
The Switch Information page is initially displayed when you first log into
the AT-GS950/16PS switch. It provides general information about the
switch. To view this information, perform the following procedure:
1. From the main menu on the left side of the page, select Switch Info.
The Switch Information Page is displayed. See Figure 14.
48
Figure 14. AT-GS950/16PS Switch Information Page
The Switch Information Page displays the following information:
System Up For - The number of days, hours, and minutes that the
switch has been running since it was last rebooted.
Runtime Image - The version number of the runtime firmware.
Boot Loader - The version number of the bootloader firmware.
Hardware Information Section:
Version - The hardware version number.
DRAM Size - The size of the DRAM, in megabytes.
Flash Size - The size of the flash memory, in megabytes.
AT-GS950/16PS Switch Web Interface User’s Guide
Administration Information Section:
Switch Name - This parameter displays the name assigned to the
switch. To assign the switch a name, refer to “System
Management Information” on page 28.
Switch Location - This parameter displays the location of the
switch. To assign the location, refer to “System Management
Information” on page 28.
Switch Contact - This parameter displays the contact person
responsible for managing the switch. To assign the name of a
contact, refer to “System Management Information” on page 28.
System MAC Address, IP Address, Subnet Mask, and Gateway
Section:
MAC Address - This parameter displays the MAC address of the
switch.
IP Address - This parameter displays the system IP address.
Refer to “Configuration of IP Address, Subnet Mask and Gateway
Address” on page 30 to manually assign an IP address or “DHCP
Client Configuration” on page 45 to activate the DHCP client.
Subnet Mask - This parameter displays the subnet mask for the
switch. Refer to “Configuration of IP Address, Subnet Mask and
Gateway Address” on page 30 to manually assign a subnet mask
or “DHCP Client Configuration” on page 45 to activate the DHCP
client.
Default Gateway - This parameter displays the default gateway IP
address. Refer to “Configuration of IP Address, Subnet Mask and
Gateway Address” on page 30 to manually assign a gateway
address or “DHCP Client Configuration” on page 45 to activate the
DHCP client.
Automatic Network Features Section:
DHCP Mode - This parameter displays the status of the DHCP
client on the switch. For information about setting this parameter,
refer to “DHCP Client Configuration” on page 45.
49
Chapter 2: System Configuration
System Log Configuration
The System log is designed to monitor the operation the AT-GS950/16PS
switch by recording the event messages it generates during normal
operation. These events may provide vital information about system
activity that can help in the identification and solutions of system
problems.
To configure the System log, perform the following procedure:
1. From the main menu on the left side of the page, click the System
folder.
The System folder expands.
2. From the System folder, select System Log Configuration.
The System Log Configuration Page is displayed. See Figure 15.
50
Figure 15. System Log Configuration Page
AT-GS950/16PS Switch Web Interface User’s Guide
3. From the Syslog Status field, select one of the following choices from
the pull-down menu:
Enable - The System log is active.
Disable - The System log is inactive.
4. From the Time Stamp field, select one of the following choices from the
pull-down menu:
Enable - Each event message recorded in the log will have a time
stamp recorded with it.
Disable - No time stamp will be recorded with the event messages.
5. Enter the Messages Buffer Size.The range is between 1 and 200.
6. Enter the Syslog Server IP Address. The format is xxx.xxx.xxx.xxx. If
the address is left at the default setting of 0.0.0.0, no server is
specified.
7. In the Facility field, enter the Facility local from the pull-down menu.
The choices range from local0 through local7.
8. Select the Logging Level. This parameter specifies what level of
event messages will be logged into the System log. Your choices are
as follows:
0 Emergency - The system is unusable.
1 Alert - Action must be taken immediately.
2 Critical - Critical conditions are displayed.
3 Error - Error conditions are displayed.
4 Warning - Warning conditions are displayed.
5 Notice - Normal but significant conditions are displayed.
6 Informational - Informational messages are displayed
7 Debug - Debug-level messages are displayed.
9. Click Apply.
The System log is now active.
10. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
51
Chapter 2: System Configuration
52
Section II
Bridge Configuration
This section contains the following chapters:
Chapter 3, “Port Configuration” on page 55
Chapter 4, “STP and RSTP” on page 61
Chapter 5, “Multiple Spanning Tree Protocol” on page 79
Chapter 6, “Static Port Trunking” on page 93
Chapter 7, “LACP Port Trunks” on page 103
Chapter 8, “Port Mirroring” on page 113
Chapter 9, “Loopback Protection” on page 119
Chapter 10, “MAC Address Table” on page 123
Chapter 11, “IGMP Snooping” on page 135
Chapter 12, “Storm Control” on page 141
Chapter 13, “Virtual LANs” on page 149
Chapter 14, “GVRP” on page 167
Chapter 15, “Quality of Service and Cost of Service” on page 175
53
54
Chapter 3
Note
Port Configuration
This chapter provides a description of the physical characteristics of the
ports and a procedure that explains how to view and change the port
settings. This chapter includes the following sections:
“Overview” on page 56
“Displaying and Configuring Ports” on page 57
To permanently save your new settings or any changes to the
configuration file, select Save Configuration to Flash from the main
menu on the left side of the page.
55
Chapter 3: Port Configuration
Overview
This chapter describes how to display and modify the physical
characteristics of an AT-GS950/16PS switch. You can display and modify
the settings of all the ports on one web page. The port characteristics that
are displayed are:
Trunk Group Number
Port type
Link Status
Admin Status
Duplex Mode
Jumbo frame
Flow control
EAP Pass
BPDU frame
These characteristics are described in the next section.
56
Displaying and Configuring Ports
Note
This procedure explains how to configure the ports on the
AT-GS950/16PS switch using the Port Configuration Page. This page
allows you to view and configure the parameter settings of individual or all
the switch ports at one time.
To configure the ports, perform the following procedure:
1. From the main menu on the left side of the page, select Physical
Interface.
AT-GS950/16PS Switch Web Interface User’s Guide
Figure 16. AT-GS950/16PS Physical Interface Page
2. Adjust the port settings as needed. Not all parameters are adjustable.
The parameters are defined as follows:
Port - Specifies the port number. The All value indicates ports 1
through 16 on the AT-GS950/16PS switch. You cannot change this
parameter.
You can use the All row value in the Port column to set the Admin.
Status, Mode, Jumbo, Flow Ctrl, EAP Pass, and BPDU fields to
the same values for all ports at the same time. In the All row when
you select Ignore, Enable or Disable in one of these columns, it
applies to all of the AT-GS950/16PS switch ports.
Trunk - This parameter indicates the trunk group number. A
number in this column indicates that the port has been added to a
trunk. This parameter can not be configured on this page,
However, for information about configuring a trunk, refer to Chapter
6, “Static Port Trunking” on page 93.
Type - Indicates the port type. On the AT-GS950/16PS, the port
type is 1000TX for 10/100/1000Base-T twisted-pair ports (1
through 14, 15R and 16R) and 100FX or 1000TX for the SFP ports
57
Chapter 3: Port Configuration
Note
(15 and 16) for copper or fiber SFP type.
Link Status - This parameter indicates the status of the link
between the port and the end node connected to the port. The
possible values are:
Up -This parameter i Indicates a valid link exists between the
port and the end node.
Down -This parameter i Indicates the port and the end node
have not established a valid link.
Admin. Status -This parameter indicates the operating status of
the port. You can use this parameter to enable or disable a port.
You may want to disable a port and prevent packets from being
forwarded if a problem occurs with the node or cable connected to
the port. You can enable the port to resume normal operation after
the problem has been fixed. You can also disable an unused port
to secure it from unauthorized connections. The possible values
are:
Ignore -This parameter applies to the All row only and i
Indicates that the Admin. Status field must be set individually
for each port.
Enabled - This parameter indicates the port is able to send and
receive Ethernet frames.
Disabled - This parameter indicates the port is not able to send
and receive Ethernet frames.
Jumbo -This parameter i Indicates whether or not jumbo frames
can be accepted by the switch. You may want to activate jumbo
frames when your switch will transmit video and audio files. The
possible values are:
Ignore -This parameter i Indicates that the All setting does not
apply to the Jumbo field. In other words, each port is set
individually.
Enabled -This parameter i Indicates the port is permitted to
accept jumbo frames.
Disabled -This parameter i Indicates the port is not permitted to
accept jumbo frames.
When QoS is enabled on a port, the Jumbo frame parameter can
not be enabled. To enable or disable QoS, see “Mapping CoS
Priorities to Egress Queues,” next and “CoS Page” on page 180
Mode -This parameter i Indicates the speed and duplex mode
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AT-GS950/16PS Switch Web Interface User’s Guide
settings for the port. You can use this parameter to set the speed
and duplex mode of a port. The possible settings are:
Ignore -This parameter i Indicates that the All setting does not
apply to the Mode field. In other words, each port is set
individually.
Auto -This parameter i Indicates the port is using AutoNegotiation to set the operating speed and duplex mode. The
actual operating speed and duplex mode of the port are
displayed in parentheses (for example, “1000F” for 1000 Mbps
full duplex mode) after a port establishes a link with an end
node.
Auto (1000F) -This parameter i Indicates the port is configured
for 1000Mbps operation in Auto-Negotiation mode.
1000/Full -This parameter i Indicates the port is configured for
1000Mbps operation in full-duplex mode.
100/Full -This parameter i Indicates the port is configured for
100Mbps operation in full-duplex mode.
10/Full -This parameter i Indicates the port is configured for
10Mbps operation in full-duplex mode.
1000/Half -This parameter i Indicates the port is configured for
1000Mbps operation in half-duplex mode.
100/Half -This parameter i Indicates the port is configured for
100Mbps operation in half-duplex mode.
10/Half -This parameter i Indicates the port is configured for
10Mbps operation in half-duplex mode.
When selecting a Mode setting, the following points apply:
When a twisted-pair port is set to Auto-Negotiation, the
end node should also be set to Auto-Negotiation to
prevent a duplex mode mismatch. A switch port using
Auto-Negotiation defaults to half-duplex if it detects
that the end node is not using Auto-Negotiation. This
can result in a mismatch if the end node is operating at
a fixed duplex mode of full-duplex. To avoid this
problem when connecting an end node with a fixed
duplex mode of full-duplex to a switch port, disable
Auto-Negotiation on the port and set the port’s speed
and duplex mode manually.
The only valid setting for the SFP ports is Auto-
Negotiation.
Flow Control - This parameter reflects the current flow control
setting on the port. The switch uses a special pause packet to
59
Chapter 3: Port Configuration
notify the end node to stop transmitting for a specified period of
time. The possible values are:
Ignore - This parameter indicates that the All setting does not
apply to the Flow Control field. In other words, each port is set
individually.
Enabled - This parameter indicates that the port is permitted to
use flow control.
Disabled - This parameter indicates that the port is not
permitted to use flow control.
EAP Pass - This parameter reflects the current Extensible
Authentication Protocol (EAP) setting on the port. The possible
values are:
Ignore - This parameter indicates that the All setting does not
apply to the EAP Pass field. In other words, each port is set
individually.
Enabled - This parameter indicates that the port is able to send
and receive EAP packets.
Disabled - This parameter indicates that the port is disabled
and is not able to send or receive EAP packets.
BPDU - This parameter reflects the current BPDU setting on the
port.The possible values are:
Ignore - This parameter indicates that the All setting does not
apply to the BPDU field. In other words, each port is set
individually.
Enabled - This parameter indicates that the switch will pass
BPDU frames through the switch and broadcast them through
all other ports.
Disabled - This parameter indicates that the switch will not pass
BPDU frames through the switch, With RSTP or STP enabled,
the switch will receive BPDU frames and process them
according to the spanning tree protocol.
3. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
60
Chapter 4
Note
STP and RSTP
This chapter provides background information about the Spanning Tree
Protocol (STP) and the Rapid Spanning Tree Protocol (RSTP). In addition,
there are procedures to configure STP and RSTP. The sections in the
chapter include:
“Overview” on page 62
“Basic STP and RSTP Configuration” on page 70
“Configure RSTP Port Settings” on page 73
“Spanning Tree Topology” on page 78
For detailed information about STP, refer to IEEE Std 802.1D. For detailed
information about RSTP, refer to IEEE Std 802.1w.
To permanently save your new settings or any changes to the
configuration file, select Save Configuration to Flash from the main
menu on the left side of the page.
61
Chapter 4: STP and RSTP
Overview
The performance of a Ethernet network can be negatively impacted by the
formation of a data loop in the network topology. A data loop exists when
two or more nodes on a network can transmit data to each other over
more than one data path. The problem that data loops pose is that data
packets can become caught in repeating cycles, referred to as broadcast
storms, that needlessly consume network bandwidth and can significantly
reduce network performance.
STP and RSTP prevent data loops from forming by ensuring that only one
path exists between the end nodes in your network. Where multiple paths
exist, these protocols place the extra paths in a standby or blocking mode,
leaving only one main active path.
In addition, STP and RSTP can activate a redundant path if the main path
goes down. So not only do these protocols guard against multiple links
between segments and the risk of broadcast storms, but they can also
maintain network connectivity by activating a backup redundant path in
case a main link fails.
Where the two protocols differ is in the time each takes to complete the
process referred to as convergence. When a change is made to the
network topology, such as the addition of a new bridge, a spanning tree
protocol must determine whether there are redundant paths that must be
blocked to prevent data loops, or activated to maintain communications
between the various network segments. This is the process of
convergence.
With STP, convergence can take up to a minute or more to complete in a
large network. This can result in the loss of communication between
various parts of the network during the convergence process, and the
subsequent lost of data packets.
RSTP is much faster. It can complete a convergence in seconds, and so
greatly diminish the possible impact the process can have on your
network. The STP implementation in the AT-S112 Management software
complies with the IEEE 802.1d standard.
Only one spanning tree at a time can be active on the switch. The default
protocol is RSTP. The RSTP implementation complies with the IEEE
802.1w standard.
The following subsections provide a basic overview on how STP and
RSTP operate and define the different parameters that you can adjust.
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AT-GS950/16PS Switch Web Interface User’s Guide
Bridge Priority
and the Root
Bridge
The first task that bridges perform when a spanning tree protocol is
activated on a network is the selection of a root bridge. A root bridge
distributes network topology information to the other network bridges and
is used by the other bridges to determine if there are redundant paths in
the network.
A root bridge is selected by the bridge priority number, also referred to as
the bridge identifier, and sometimes the bridge’s MAC address. The bridge
with the lowest bridge priority number in the network is selected as the root
bridge. If two or more bridges have the same lowest bridge priority
number, the one with the lowest MAC address is designated as the root
bridge.
You can change the bridge priority number in the AT-S112 Management
software. You can designate which switch on your network as the root
bridge by giving it the lowest bridge priority number. You may also
consider which bridge should function as the backup root bridge in the
event you need to take the primary root bridge off line and assign that
bridge the second lowest bridge identifier number.
The bridge priority has a range 0 to 61440 in increments of 4096. To make
this easier for you, the AT-S112 Management software divides the range
into increments. You specify the increment that represents the desired
bridge priority value. The range is divided into sixteen increments, as
shown in Table 1.
Table 1 Bridge Priority Value Increments
Increment
0x0000 0 0x8000 32768
0x1000 4096 0x9000 36864
0x2000 8192 0xA000 40960
0x3000 12288 0xB000 45056
0x4000 16384 0xC000 49152
0x5000 20480 0xD000 53248
0x6000 24576 0xE000 57344
0x7000 28672 0xF000 61440
Bridge
Priority
Increment
Bridge
Priority
63
Chapter 4: STP and RSTP
Path Costs and Port Costs
After the root bridge has been selected, the bridges determine if the
network contains redundant paths and, if one is found, select a preferred
path while placing the redundant paths in a backup or blocking state.
Where there is only one path between a bridge and the root bridge, the
bridge is referred to as the designated bridge and the port through which
the bridge is communicating with the root bridge is referred to as the root
port.
If redundant paths exist, the bridges that are a part of the paths must
determine which path is the primary, active path, and which path(s) are
placed in the standby, blocking mode. This is accomplished by an
determination of path costs. The path offering the lowest cost to the root
bridge becomes the primary path and all other redundant paths are placed
into blocking state.
Path cost is determined by evaluating port costs. Every port on a bridge
participating in STP has a cost associated with it. The cost of a port on a
bridge is typically based on port speed. The faster the port, the lower the
port cost. The exception to this is the ports on the root bridge, where all
ports have a port cost of 0.
Path cost is the sum of the port costs between a bridge and the root
bridge.
The port cost of a port on the switch is adjustable through the AT-S112
Management software. For STP and RSTP, the range is from 0 to
200,000,000.
Port Priority
If two paths have the same port cost, the bridges must select a preferred
path. In some instances this can involve the use of the port priority
parameter which is used as a tie breaker when two paths have the same
cost.
The range for port priority is 0 to 240. As with bridge priority, this range is
broken into increments, in this case multiples of 16. To select a port
priority for a port, you enter the desired value. Table 2 on page 65 lists the
values that are valid.
64
AT-GS950/16PS Switch Web Interface User’s Guide
.
Table 2. Valid Port Priority Values
Step
Port
Priority
10
216
332
448
564
680
796
8112
9 128
10 144
11 160
Forwarding
Delay and
Topology
Changes
12 176
13 192
14 208
15 224
16 240
If there is a change in the network topology due to a failure, removal, or
addition of any active components, the active topology also changes. This
may trigger a change in the state of some blocked ports. However, a
change in a port state is not activated immediately.
It may take time for the root bridge to notify all bridges that a topology
change has occurred, especially if it is a large network. A temporary data
loop could occur if a topology change is made before all bridges have
been notified and that could adversely impact network performance.
To forestall the formation of temporary data loops during topology
changes, a port designated to change from blocking to forwarding passes
through two additional states - listening and learning - before it begins to
forward frames. The amount of time a port spends in these states is set by
the forwarding delay value. This value states the amount of time that a port
spends in the listening and learning states prior to changing to the
forwarding state.
65
Chapter 4: STP and RSTP
Note
The forwarding delay value is adjustable in the AT-S112 Management
software. The appropriate value for this parameter depends on a number
of variables; the size of your network is a primary factor. For large
networks, you should specify a value large enough to allow the root bridge
sufficient time to propagate a topology change throughout the entire
network. For small networks, you should specify a smaller value so that
the time for a topology change is optimized for minimum data loss.
The forwarding delay parameter applies only to ports on the switch
that are operating STP-compatible mode.
Hello Time and Bridge Protocol Data Units (BPDU)
The bridges that are part of a spanning tree domain communicate with
each other using a bridge broadcast frame that contains a special section
devoted to carrying STP or RSTP information. This portion of the frame is
referred to as the bridge protocol data unit (BPDU). When a bridge is
brought online, it issues a BPDU in order to determine whether a root
bridge has already been selected on the network, and if not, whether it has
the lowest bridge priority number of all the bridges and should therefore
become the root bridge.
The root bridge periodically transmits a BPDU to determine whether there
have been any changes to the network topology and to inform other
bridges of topology changes. The frequency with which the root bridge
sends out a BPDU is called the hello time. This is a value that you can set
in the AT-S112 Management software. The interval is measured in
seconds. Consequently, if the switch is selected as the root bridge of a
spanning tree domain, it transmits a BPDU every two seconds.
Point-to-Point and Edge Ports
This section applies only to RSTP. Part of the task of configuring RSTP is
defining the port types on the bridge, which is directly related to the
device(s) connected to the port. With the port types defined, RSTP can
reconfigure a network much quicker than STP when a change in network
topology is detected.
There are two possible selections:
Point-to-point port
Edge port
If a bridge port is connected to another bridge or router port, it normally
operates in full-duplex mode and is functioning as a point-to-point port.
Figure 17 on page 67 illustrates two switches that are connected with one
data link. This link is operating between two point-to-point ports.
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AT-GS950/16PS Switch Web Interface User’s Guide
Point-to-Point Ports
Workstation
Edge Port
Figure 17. Point-to-Point Ports
A port operates as an edge port when it is connected to a network terminal
device such as a workstation or a server. An edge port on a bridge should
not have any STP or RSTP devices connected to it either directly or
through another device connected to that port. In this configuration since
the port has no STP or RSTP devices connected to it, it will always forward
network traffic. Figure 18 illustrates a port functioning as an edge port.
Mixed STP and
RSTP Networks
Figure 18. Edge Port
RSTP IEEE 802.1w is fully compliant with STP IEEE 802.1d. Your network
can consist of bridges running both protocols. STP and RSTP in the same
network can operate together to create a single spanning tree domain.
If you decide to activate spanning tree on the switch, Allied Telesis
recommends RSTP instead of STP even when all of other switches in the
network are running STP. The AT-GS950/16PS switch can combine RSTP
with the STP of the other switches. The switches monitors the traffic on
each port for BPDU packets. Ports that receive RSTP BPDU packets
operate in RSTP mode while ports receiving STP BPDU packets operate
in STP mode.
67
Chapter 4: STP and RSTP
UUU
U
U
U
Ports blocked by STP
Blocked Data Links
Spanning Tree
and VLANs
The spanning tree implementation in the AT-S112 Management software
can be a single-instance spanning tree as described in this chapter. If you
choose to define multiple spanning trees on this switch, go to Chapter 5,
“Multiple Spanning Tree Protocol” on page 79.
The single spanning tree encompasses all ports on the switch. If the ports
are divided into different VLANs, the spanning tree crosses the VLAN
boundaries. This can pose a problem in networks containing multiple
VLANs that span two bridges and are connected with untagged ports. In
this situation, spanning tree blocks a data link because it detects a
suspected data loop. This can cause fragmentation of your VLANs.
This issue is illustrated in Figure 42. VLANs 1 – 3 span two switches. One
link consisting of untagged ports connect each VLAN. If STP or RSTP is
activated on the switches, two of the links are disabled. As a direct result,
two VLANs are disconnected between the bridges. In this example, the
ports (on the non-root switch) that link the two parts of the VLANs 2 - 3 are
changed to the blocking state, which disrupts these VLAN connections.
68
Figure 19. STP and VLAN Fragmentation with Untagged Ports
You can avoid this problem by connecting the switches using tagged
instead of untagged ports when you plan to have STP or RSTP enabled
on your network. If each port connecting the two bridges is a tagged
member of all three VLANs, then traffic for each of the VLANs can still flow
through one the data links if the other two are blocked by Spanning Tree.
The second and third data links act as redundant links in case the primary,
unblocked data link becomes disabled. See Figure 20 for an example of
this solution.
AT-GS950/16PS Switch Web Interface User’s Guide
Note
TTT
T
T
T
Ports blocked by STP
Blocked Data Links
VLAN
1-3
VLAN
1-3
VLAN
1-3
VLAN
1-3
VLAN
1-3
VLAN
1-3
Figure 20. STP and VLAN Compatibility with Tagged Ports
For information about tagged and untagged ports, refer to Chapter
13, “VLAN Overview” on page 150.
69
Chapter 4: STP and RSTP
Basic STP and RSTP Configuration
To configure the basic STP and RSTP settings, perform the following
procedure:
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the RSTP folder.
The RSTP folder expands.
4. Form the RSTP folder, select RSTP.
The Rapid Spanning Tree Configuration Page is displayed. See Figure
21.
70
Figure 21. Rapid Spanning Tree Configuration Page
AT-GS950/16PS Switch Web Interface User’s Guide
Note
Note
The RSTP Configuration page allows you to configure basic STP
(STP-Compatible) or RSTP protocols as well as to view current
settings of the feature.
In the upper portion of the page, you can set the
following parameters:
Global RSTP Status - Set this field to activate or de-activate the
RSTP feature on the switch. From the Global RSTP Status field at
the top of the page, select one of the following choices from the
pull-down menu:
Enable - The RSTP feature is active. The other parameter fields
on the web page become active and are eligible for data to be
entered.
Disable - The RSTP feature is inactive. The other parameter
fields on the web page become inactive and are greyed out so
that data cannot be entered.
Protocol Version - Set this field to activate RSTP or STP on the
switch. To activate this field, select RSTP or STP-compatible and
then click Apply at the top of the page.
In the middle section of the page, the following fields
are listed:
You cannot change these fields.
Root Port - The active port on the switch that is communicating
with the root bridge. If the switch is the root bridge for the LAN,
then there is no root port and the root port parameter is set to 0.
Root Path Cost - The sum of all the root port costs of all the
bridges between the switch’s root port and the root bridge including
the switch’s root port cost.
Time Since Topology Change - The time in seconds since the
last topology change took place. When RSTP detects a change to
the LAN’s topology or when the switch is rebooted, this parameter
is reset to 0 seconds and begins incrementing until the next
topology change is detected.
To update the Time Since Topology Change parameter, you must
refresh your browser.
Topology Change Count - An integer that reflects the number of
times RSTP has detected a topology change on the LAN since the
switch was initially powered on or rebooted.
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Chapter 4: STP and RSTP
The following parameters refer to the designated root
bridge. You cannot change these fields.
Designated Root - This parameter includes two fields: the root
bridge priority and the MAC address of the root bridge. For
example, 1000 00C08F1211BB shows the root bridge priority as
1000, and 00C08F1211BB as the MAC address.
Hello Time - This parameter is the Hello Me. See “Hello Time and
Bridge Protocol Data Units (BPDU)” on page 66. This parameter
affects only the root bridge.
Maximum Age - The parameter displays the maximum amount of
time that BPDU’s are stored before being deleted on the root
bridge.
Forward Delay - The parameter displays the time interval between
generating and sending configuration messages by the root bridge.
The bottom section of the web page provides
information about the bridge. The following parameters
appear in the bottom third of the web page:
Bridge ID - The Bridge ID is the MAC address of the bridge. The
bridge identifier is used as a tie breaker in the selection of the root
bridge when two or more bridges have the same bridge priority.
You cannot change this parameter.
Bridge Priority - The priority number for the bridge, in
hexadecimal format. This number is used to determine the root
bridge for RSTP. The bridge with the lowest priority number is
selected as the root bridge. If two or more bridges have the same
priority value, that is, the lowest value of all the other bridges, then
the bridge with the numerically lowest MAC address becomes the
root bridge. When a root bridge goes offline, the bridge with the
lowest priority number automatically takes over as the root bridge.
This parameter can be from 0X0000 to 0XF000, with 0XF000
being the highest priority.
Bridge Hello Time - This is the time interval between generating
and sending configuration messages by the bridge. This parameter
is active only when the switch is the root bridge.
Bridge Maximum Age - The length of time after which stored
bridge protocol data units (BPDU’s) are deleted by the bridge.
Bridge Forward Delay - This is the time interval between
generating and sending configuration messages by the bridge.
72
5. Once you have configured the parameters, click Apply.
6. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
Configure RSTP Port Settings
This section contains the following topics:
“Configure the Basic RSTP Port Settings,” next
“Configure the Advanced RSTP Port Settings” on page 75
AT-GS950/16PS Switch Web Interface User’s Guide
Configure the
Basic RSTP Port
Settings
To configure the basic RSTP port settings, perform the following
procedure:
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the RSTP folder.
The RSTP folder expands.
4. From the RSTP folder, select the RSTP Basic Port.
The AT-GS950/16PS RSTP Basic Port Configuration Page is
displayed. See Figure 22 for a partial view of this page.
Figure 22. AT-GS950/16PS RSTP Basic Port Configuration Page
This page displays the following information about the ports:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
You can select the All row to apply the same setting to all ports of
your switch for the STP Status, Priority, and Path Cost fields.
Trunk - Indicates the trunk assignment of a port.
Link Status - Indicates if the port link status is active (Up) or
inactive (Down).
Port State - Indicates one of the following port states:
Blocking - A blocking state does not allow network traffic to be
73
Chapter 4: STP and RSTP
sent or received on a the port except for BPDU data. A port with
a higher path cost to the root bridge than another on the switch
will cause a switching loop and is placed in the blocking state by
the Spanning Tree algorithm. The port’s state may change to
the forwarding state if the other links in use fail and the
Spanning Tree algorithm determines the port may transition to
the forwarding state.
Listening - This state occurs on a port during the convergence
process. The port in the listening state processes BPDUs and
awaits new information that would cause the port to return to the
blocking state.
Learning - While the port does not yet forward frames (packets)
in this state, the port does learn source addresses from frames
received and adds them to the filtering (switching) database.
Forwarding - A port that both receives and sends data. This
indicates normal operation. STP continues to monitor the port
for incoming BPDUs that indicate the port should return to the
blocking state to prevent a loop.
Disabled - This state is not strictly part of STP. However, a
network administrator can manually disable a port.
Role - Indicates one of the following port roles:
Disabled - The Disabled Port role is assigned if the port is not
operational or is excluded from the active topology by
management or it is a network access port (IEEE Std 802.1X)
and it is Unauthorized, or its Administrative Bridge Port state is
Disabled.
Root - If the least cost path to the root is through this port, then
it becomes the root port for this bridge.
Designated - If this is the designated bridge for the LAN and if
the root path cost information received on this port is greater
than the root port's path cost and less than any other port's
received information, then this port becomes the designated
port.
Backup - Any operational Bridge Port that is not a Root or
Designated Port is a Backup Port if the Bridge is the Designated
Bridge for the attached LAN.
Alternate - Any operational Bridge Port that is not a Root or
a Designated Port is an Alternate Port if that Bridge is not the
Designated Bridge for the attached LAN.
74
STP Status - Indicates if spanning tree protocol (either RSTP or
STP-Compatible) is active or not on the port. Select one of the
following choices from the pull-down menu:
AT-GS950/16PS Switch Web Interface User’s Guide
Enable - The spanning tree protocol (both RSTP or STPCompatible) is enabled on the port.
Disabled - The spanning tree protocol (both RSTP or STPCompatible) is disabled on the port.
Priority - Indicates the port priority. See “Port Priority” on page 64
for more information.
Path Cost - Indicates the Path Cost assigned to each port. For
STP, the range is from 0 to 65,535. For RSTP, the range is from
0 to 200,000,000. The Path cost is described in “Path Costs and
Port Costs” on page 64.
5. Click Apply for the port you are configuring.
6. To configure all of the ports to the same settings, in the All row,
configure one, two, or all of the following settings: STP Status,
Priority and Port Cost.
7. Click Apply.
Configure the
Advanced RSTP
Port Settings
8. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
To configure the advanced RSTP port settings, perform the following
procedure:
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the RSTP folder.
The RSTP folder expands.
4. From the RSTP folder, select RSTP Advanced Port folder.
The AT-GS950/16PS RSTP Advanced Port Configuration Page is
displayed. See Figure 23 on page 75 for a partial view of this page.
Figure 23. AT-GS950/16PS RSTP Advanced Port Configuration Page
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Chapter 4: STP and RSTP
This page displays the following information about the ports:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
You can select the All row to apply the same setting to all ports of
your switch for the AdminOperEdge, Admin/OperPtoP, and
Migration fields.
Trunk - Indicates the trunk assignment of a port.
Link - Indicates that the port’s link is active (Up) or inactive
(Down).
State - Indicates one of the following port states:
Blocking - A blocking state does not allow network traffic to be
sent or received on a the port except for BPDU data. A port with
a higher path cost to the root bridge than another on the switch
causes a switching loop and is placed in the blocking state by
the Spanning Tree algorithm. The port’s state may change to
the forwarding state if the other links in use fail and the
Spanning Tree algorithm determines the port may transition to
the forwarding state.
Listening - This state occurs on a port during the convergence
process. The port in the listening state processes BPDUs and
awaits new information that would cause the port to return to the
blocking state.
Learning - While the port does not yet forward frames
(packets), in this state the port does learn source addresses
from frames received and adds them to the filtering (switching)
database.
Forwarding - A port that both receives and sends data. This
indicates normal operation. STP continues to monitor the port
for incoming BPDUs that indicate the port should return to the
blocking state to prevent a loop.
Disabled - This state is not strictly part of STP. However, a
network administrator can manually disable a port.
Role - Indicates one of the following port roles:
Disabled - The Disabled Port role is assigned if the port is not
operational or is excluded from the active topology by
management or it is a network access port (IEEE Std 802.1X)
and it is Unauthorized, or its Administrative Bridge Port state is
Disabled.
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Root - If the least cost path to the root is through this port, then
it becomes the root port for this bridge.
Designated - If this is the designated bridge for the LAN and if
AT-GS950/16PS Switch Web Interface User’s Guide
this port receives root path cost information that is greater than
the root port's path cost and less than any other port's received
information, then this port becomes the designated port.
Backup - Any operational Bridge Port that is not a Root or
Designated Port is a Backup Port if the Bridge is the Designated
Bridge for the attached LAN.
Alternate - Any operational Bridge Port that is not a Root or
a Designated Port is an Alternate Port if that Bridge is not the
Designated Bridge for the attached LAN.
Admin/OperEdge - Indicates if a port is connected to an edge
device in the network topology or not.
True - The port is connected to an edge device and the port will
always be in a forwarding state.
False - The port is not connected to an edge device.
Admin/OperPtoP - Indicates if the port is connected to another
network device (point-to-point) in the network topology.
True - The port is connected to a network device in the network
topology.
False - The port is not connected to a network device in the
network topology.
Migration - Indicates if the port is configured to accept RSTP and
STP BPDUs
5. Click Apply for the port you are configuring.
6. To configure all of the ports to the same settings, in the All row,
configure one, two, or all of the following settings: Admin/OperEdge,
Admin/OperPtoP, and Migration.
7. Click Apply.
8. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
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Chapter 4: STP and RSTP
Spanning Tree Topology
To view the current spanning tree topology, perform the following
procedure:
1. From the main menu on the left side of the page, select Bridge.
This folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
3. From the Spanning Tree folder, select Topology Info.
The AT-GS950/16PS Designated Topology Information Page is
displayed. See Figure 24 for a partial view of this page.
Figure 24. AT-GS950/16PS Designated Topology Information Page
This page is contains status information only and there are no
parameters to configure. The following information is displayed about
the ports:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
Trunk - The trunk of which the port is a member.
Link Status - Whether the link on the port is up or down.
Designated Root - The designated root bridge to which the
switch’s root port is actively connected.
Designated Cost - The sum of all the root port costs on all
bridges, including the switch, between the switch and the root
bridge.
Designated Bridge - An adjacent bridge to which the root port of
the switch is actively connected.
Designated Port - The root bridge to which the root port of the
switch is actively connected.
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Chapter 5
Multiple Spanning Tree Protocol
This chapter provides the procedures for configuring Multiple Spanning
Tree Protocol (MSTP). You can find an overview and configuration
guidelines for this feature in “MSTP Overview” on page 349.
When you configure MSTP, the information should be entered in order on
the following web pages:
“Multiple Spanning Tree Configuration” on page 80
“Port Configuration” on page 83
“VLAN Mapping” on page 86
“Port Settings” on page 88
“Topology Information” on page 90
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Chapter 5: Multiple Spanning Tree Protocol
Multiple Spanning Tree Configuration
To configure the MSTP settings, perform the following procedure:
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the MSTP folder.
The MSTP folder expands.
4. From the MSTP folder, select MSTP.
The Multiple Spanning Tree Configuration Page is displayed. See
Figure 25 on page 80.
80
Figure 25. Multiple Spanning Tree Configuration Page
The MSTP Configuration page allows you to configure the MSTP
parameters as well as to view current settings of the feature.
In the upper portion of the page, you can set the
AT-GS950/16PS Switch Web Interface User’s Guide
Note
Caution
following parameters:
Global MSTP Status - Set this field to Enable or Disable the
MSTP feature on the switch. The Global MSTP Status must be set
to Enable before the other MSTP configuration parameters can be
set.
Both RSTP and BPDU Passthrough must be disabled before you
enable MSTP.
Enabling or disabling MSTP causes the switch to temporarily stop
switching Ethernet network traffic.
Maximum MST Instances - This specifies the maximum number
of Multiple Spanning Tree Instances (MSTIs) that can be
configured. The range is 1 - 31.
Bridge Priority - This parameter specifies the priority used in
determining the regional root for a particular MSTI. For more
information about Bridge Priority, see Table 11 on page 360.
Region Name - This parameter specifies the region’s name where
the bridge is a member. This name must be identical to the
regional names specified on other switches in the same MSTP
region. See “Multiple Spanning Tree Regions” on page 358 for
more information.
Region Revision - The parameter indicates the region’s revision
and must be identical to the regional names specified on other
switches in the same MSTP region. See “Multiple Spanning Tree
Regions” on page 358 for more information.
Dynamic Path Cost Calculation - This parameter is either True or
False. When set to True, the path cost of each port on the bridge is
dynamically calculated based on the port speed. If the parameter is
set to False, the path cost of the bridge is based on the initial value
of the port speed.
In the middle section of the page, the status of the
MSTP bridge parameters are shown. The bottom
section of the page is where you can adjust the values
of these parameters. The following fields are listed:
Maximum Age - The Maximum Age defines the amount of time a
port will wait for STP/RSTP information. MSTP uses this parameter
when interacting with STP/RSTP domains on the boundary ports.
Its range is 6 - 40 seconds.
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Chapter 5: Multiple Spanning Tree Protocol
5. Once you have configured the parameters, click Apply.
6. From the main menu on the left side of the page, select Save
Forward Delay - The Forward Delay defines the time that the
bridge spends in the listening and learning states. Its range is
4 - 30 seconds.
Maximum Hop Count - The Maximum Hop Count is a parameter
set in a BPDU packet when it originates. It is decremented by 1
each time it is retransmitted by the next bridge. When the Hop
Count value reaches zero, the bridge drops the BPDU packet. Its
range is 6 - 40 hops.
Transmit Hold Count - The Transmit Hold Count specifies the
maximum number of BPDUs that the bridge can send per second.
Its range is 1 - 10.
Configuration to Flash to permanently save your changes.
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Port Configuration
AT-GS950/16PS Switch Web Interface User’s Guide
To configure the MSTP parameters for each of the ports, perform the
following procedure:
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the MSTP folder.
The MSTP folder expands.
4. From the MSTP folder, select MSTP Port Configuration.
The AT-GS950/16PS MSTP Port Configuration Page is displayed. See
Figure 26 for a partial view of this page.
Figure 26. AT-GS950/16PS MSTP Port Configuration Page
You may choose a port and configure its MSTP parameters on this
page. The following information is displayed:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
You can select the All row to apply the same setting to all ports of
your switch for the Point-to-Point Status, Edge Port, MSTP
Status, Protocol Migration, AutoEdge Status, Restricted Role,
Restricted TCN fields.
Path Cost - Specifies the cost of a port to the root.
Priority - Specifies the spanning tree port priority.
PointToPoint Status - Indicates if the port is connected to another
network device (point-to-point) in the network topology. See “Pointto-Point and Edge Ports” on page 66 for more information.
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Chapter 5: Multiple Spanning Tree Protocol
ForcedTrue - The port is connected to a network device in the
network topology.
ForcedFalse - The port is not connected to a network device in
the network topology.
Auto - The switch will automatically determine the port type.
Edge Port - Indicates if a port is connected to an edge device in
the network topology or not. See “Point-to-Point and Edge Ports”
on page 66 for more information.
True - The port is connected to an edge device and the port will
always be in a forwarding state.
False - The port is not connected to an edge device.
MSTP Status - Indicates if MSTP is Enabled or Disabled.
Enabled - MSTP is active on the port.
Disabled - MSTP is inactive on the port.
Protocol Migration - A switch running MSTP supports a built-in
protocol migration mechanism that enables it to inter-operate with
legacy 802.1D switches.
True - The switch is able to inter-operate with 802.1D BPDU
packets.
False - This switch can only operate with RSTP and MSTP
packets.
Hello Time - The Hello Time is frequency with which the root
bridge sends out a BPDU. See “Hello Time and Bridge Protocol
Data Units (BPDU)” on page 66 for more information.
AutoEdge Status - This parameter allows the switch to detect if
the port functioning as an edge port.
Restricted Role - This parameter prevents the port from becoming
a root port.
True - The port is prevented from being a root port or a port that
is used to communicate with the root bridge.
False - This switch can only operate with RSTP and MSTP
packets.
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The net effect of setting all ports on the switch to True is that it
forces the switch into the role of the root bridge regardless of other
path costs in the network.
AT-GS950/16PS Switch Web Interface User’s Guide
Restricted TCN - The Restricted TCN parameter does not allow
Topology Change Notification (TCN) BPDUs to be processed on
the port.
True - The port cannot process receive/transmit TCN BPDUs.
False - The port can process receive/transmit TCN BPDU
packets.
5. Once you have configured the parameters, click Apply in the Action
column.
6. If you choose to change the MSTP port configuration for other ports,
repeat steps 4 and 5.
7. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
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Chapter 5: Multiple Spanning Tree Protocol
VLAN Mapping
You can create, modify and delete MSTP settings with the procedures in
the following sections:
”Open MSTP VLAN Mapping Page”
”Create VLAN Mapping to MST Instance”.
“Modify MST Instance” on page 87.
“Delete MST Instance” on page 87.
Open MSTP
VLAN Mapping
Page
1. From the main menu on the left side of the page, select Bridge.
The Bridge folder expands.
2. From the Bridge folder, select the Spanning Tree folder.
The Spanning Tree folder expands.
3. From the Spanning Tree folder, select the MSTP folder.
The MSTP folder expands.
4. From the MSTP folder, select MSTP VLAN Mapping.
The MSTP VLAN Mapping Page is displayed. See Figure 27.
Figure 27. MSTP VLAN Mapping Page
Create VLAN
Mapping to MST
Instance
86
1. Enter the MSTP Instance ID. You can enter any number of MSTP IDs
up to the maximum MSTP ID. See “Multiple Spanning Tree
Configuration” on page 80 for more information.
2. Enter an existing VLAN ID in the ADD VLAN field that you want to
associate with the MSTI ID entered in step 4.
3. Click Add.
The Instance ID and the Mapped VLAN will be displayed in the table
on the page.
4. You may add as many VLANs to one MST Instance by repeating steps
4 through 6.
AT-GS950/16PS Switch Web Interface User’s Guide
5. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
Modify MST
Instance
Delete MST
Instance
If you wish to modify a MST Instance, you must first delete the instance
and then redefine it. Refer to “Create VLAN Mapping to MST Instance” on
page 86 for more information.
1. In the Action column of the table, click on Delete for the MST Instance
that want to delete.
The instance is deleted along with the mapped associations to the
VLANs that are listed.
2. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
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Chapter 5: Multiple Spanning Tree Protocol
Port Settings
To configure the MSTP port settings, perform the following procedure:
1. From the main menu on the left side of the page, select Bridge.
2. From the Bridge folder, select the Spanning Tree folder.
3. From the Spanning Tree folder, select the MSTP folder.
4. From the MSTP folder, select MSTP Port Settings.
The Bridge folder expands.
The Spanning Tree folder expands.
The MSTP folder expands.
The MSTP Port Settings Page is displayed. See Figure 28.
Figure 28. MSTP Port Settings Page
You may choose a port and configure its MSTP parameters on this
page. The following information is displayed:
Port - Indicates ports 1 through 16 on the AT-GS950/10PS switch.
You can select the All row to apply the same settings to all ports
on your switch for the Port State field.
MSTP Instance ID - Indicates the MSTP Instance that associated
with this port.
Port State - This parameter activates or deactivates the port.
Select one of the following choices from the pull-down menu:
Enable - Allows the port to forward packets.
Disable - Does not allows the port to forward packets.
Priority - This is the port priority used by MSTP in calculating path
costs when two ports on the switch have the same port cost.
Cost - This is the port cost used by MSTP when calculating path
cost to the root bridge.
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5. Once you have configured the parameters, click Apply in the Action
column.
AT-GS950/16PS Switch Web Interface User’s Guide
6. If you choose to change the MSTP port settings for other ports, repeat
steps 4 and 5.
7. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
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Chapter 5: Multiple Spanning Tree Protocol
Topology Information
To configure the MSTP port settings, perform the following procedure:
1. From the main menu on the left side of the page, select Bridge.
2. From the Bridge folder, select the Spanning Tree folder.
3. From the Spanning Tree folder, select the MSTP folder.
4. From the MSTP folder, select MSTP Port Settings.
The Bridge folder expands.
The Spanning Tree folder expands.
The MSTP folder expands.
The AT-GS950/16PS Topology Information Page is displayed. See
Figure 29.
A partial view of the AT-GS950/16PS Topology Information Page is
displayed. See Figure 29.
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Figure 29. AT-GS950/16PS Topology Information Page
The following information displayed on this page shows the current
status of MSTP for each port:
Port - Indicates ports 1 through 16 on the AT-GS950/16PS switch.
Designated Root - The designated root bridge to which the
switch’s root port is actively connected.
Root Priority - This parameter specifies the priority used in
determining the regional root for a particular MSTI. For more
information, see Table 11 on page 360.
Designated Bridge - The bridge providing the least cost path to
the root bridge from a network segment.
Designated Port - The port providing the least cost path to the
root bridge from a network segment.
Designated Cost - The cost from the designated bridge to the root
bridge.
AT-GS950/16PS Switch Web Interface User’s Guide
Regional Root - The root bridge of the MST instance.
Regional Root Priority - The priority of the regional root port.
Regional Path Cost - The path cost from the regional root port to
the regional root bridge.
Type - This specifies the regional port type which can be either a
point-to-point or an edge type port. See “Point-to-Point and Edge
Ports” on page 66 for more information.
Role - Indicates the port’s role which may be Disabled, Root,
Designated, Backup, or Alternate. See the parameter definitions
described for Role under “Configure the Basic RSTP Port Settings”
on page 73 for more information.
Port State - Indicates the ports spanning tree state which may be
Blocking, Listening, Learning, Forwarding, Disabled. See the
parameter definitions described for Port State under “Configure
the Basic RSTP Port Settings” on page 73 for more information.
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Chapter 5: Multiple Spanning Tree Protocol
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Chapter 6
Note
Note
Static Port Trunking
This chapter contains a description of port trunking and the procedures for
creating, modifying, and deleting a static port trunk. The following topics
are discussed:
“Overview” on page 94
“Create a Port Trunk” on page 97
“Modify a Port Trunk” on page 99
“Disable a Port Trunk” on page 101
For information about Link Aggregation Control Protocol (LACP) port
trunking, see Chapter 11, “LACP Port Trunks” on page 155.
To permanently save your new settings or any changes to the
configuration file, select Save Configuration to Flash from the main
menu on the left side of the page.
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Chapter 6: Static Port Trunking
Static Trunk
Overview
A port trunk is an economical way for you to increase the bandwidth
between the Ethernet switch and another networking device, such as a
network server, router, workstation, or another Ethernet switch. A port
trunk is a group of ports that have been grouped together to function as
one logical path. A port trunk increases the bandwidth between the switch
and another network device and is useful in situations where a single
physical link between the devices is insufficient to handle the traffic load.
A static port trunk consists of two to eight ports on the switch that function
as a single virtual link between the switch and another device. A static port
trunk improves performance by distributing the traffic across multiple ports
between the devices and enhances reliability by reducing the reliance on a
single physical link.
A static trunk is easy to configure. You designate the ports on the switch
that are in the trunk and the AT-S112 Management software on the switch
automatically groups them together.
The example in Figure 30 illustrates a static port trunk of four links
between two AT-GS950/16PS switches.
Figure 30. Static Port Trunk Example
94
AT-GS950/16PS Switch Web Interface User’s Guide
Note
Network equipment vendors tend to employ different techniques to
implement static trunks. Consequently, a static trunk on one device may
be incompatible with the same feature on a device from a different
manufacturer. For this reason static trunks are typically employed only
between devices from the same vendor. That is not to say that an Allied
Telesis Layer 2 managed switch cannot form a static trunk with a device
from another manufacturer; however, the implementations of static
trunking on the two devices may be incompatible.
Also, note that a static trunk does not provide for redundancy or link
backup. If a port in a static trunk loses its link, the trunk’s total bandwidth is
diminished. Although the traffic carried by the lost link is shifted to one of
the remaining ports in the trunk, the bandwidth remains reduced until the
lost link is re-established or you reconfigure the trunk by adding another
port to it.
General Guidelines
Following are the guidelines for creating a static trunk:
Allied Telesis recommends setting static port trunks
between Allied Telesis networking devices to ensure
compatibility.
A static trunk can contain up to eight ports.
The ports of a static trunk must be of the same medium
type. They can be all twisted-pair ports or all fiber optic
ports, but not a combination of the two.
The ports of a trunk can be either consecutive (for
example, Ports 2 through 4) or nonconsecutive (for
example, ports 3, 5, and 7).
Before creating a port trunk, verify that the settings are
the same for all ports in the trunk including speed
(1000/Full), duplex mode, flow control, back pressure
settings and VLAN membership. If these settings are
not the same, then the switch does not allow you to
create the trunk.
When a trunk group is formed with only combo ports as members, all
port members are configured to the forced port mode at 1000/Full.
The trunk ports on the connecting network switch should also be
configured for 1000/Full to insure speed and duplex compatibility
between the switches.
After you have created a port trunk, a change to the
speed, duplex mode, flow control, or back pressure of
any port in the trunk automatically implements the
same change on all the other member ports.
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Chapter 6: Static Port Trunking
A port can belong to only one static trunk at a time.
The ports of a static trunk can be configured to be
members of more than one VLAN.
The ports of a static trunk can be either untagged or
untagged members of the same VLAN.
The switch selects a port in the trunk to handle broadcast packets and
packets of unknown destination. The switch makes this choice based on a
hash algorithm, depending upon the source and destination MAC
addresses.
96
Create a Port Trunk
Caution
This procedure explains how to create a static port trunk.
To create a port trunk, perform the following procedure:
1. Select the Bridge folder.
AT-GS950/16PS Switch Web Interface User’s Guide
Do not connect the cables of a port trunk to the ports on the switch
until you have configured the ports on both the switch and the end
nodes. Connecting the cables prior to configuring the ports can
create loops in your network topology. Loops can result in broadcast
storms which can severely limited the effective bandwidth of your
network.
The Bridge folder expands.
2. From the Bridge folder, select the Trunk Config folder.
The Trunk Config folder expands.
3. From the Trunk Config folder, select Trunking.
A partial view of the Trunking Page is displayed in Figure 31.
Figure 31. Trunking Page
If the switch does not contain a port trunk, all of the ports on the switch
are unchecked. If there is a port trunk, the ports in the trunk are
checked.
4. Click the dialog boxes of the ports that will make up the port trunk.
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Chapter 6: Static Port Trunking
A check in a box indicates the port is a member of the trunk. No check
means the port is not a member. A port trunk can contain up to eight
ports.
5. Change the Trunk Status from Disable to another setting. The choice
in the status field are the following:
Active - The specific aggregator will broadcast and respond to
LACPDU (LACP Data Unit) packets. This setting enables
the LACP feature for the trunk.
Passive - The specific aggregator will not broadcast LACPDU
packets, but it will respond to them. This setting disables the LACP
feature for the trunk.
Manual - Enables static port trunking and disables the LACP
feature for the trunk.
Disable - Disables the static port trunk and disables the LACP
feature for the trunk.
6. Click Apply.
7. If you did not select the trunk mode Disabled, the trunk is now
operational on the switch.
8. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
9. Configure the port trunk on the other switch.
10. Connect the Ethernet cables between trunk ports on the AT-GS950/
16PS switch and the trunk ports on the other switch.
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Modify a Port Trunk
Caution
This procedure explains how to change the status of a port trunk and add
or remove ports from a port trunk.
To add or remove ports from a trunk, perform the following procedure:
1. Disconnect all of the Ethernet cables from the ports of the trunk.
2. Select the Bridge folder.
AT-GS950/16PS Switch Web Interface User’s Guide
Before you disable or modify a port trunk, disconnect all of the
cables from the ports of the trunk. Leaving the cables connected
during the reconfiguration of a trunk can create loops in your
network topology. Loops can result in broadcast storms which can
severely limited the effective bandwidth of your network.
The Bridge folder expands.
3. From the Bridge folder, select the Trunk Config folder.
The Trunk Config folder expands.
4. From the Trunk Config folder, select Trunking.
The Trunking Page is shown in Figure 31 on page 97.
5. Click the status of the port trunk you want to modify and change the
status to one of the following options:
Disable - Disables the port trunk.
Active - The aggregator will broadcast and respond to LACPDU
(LACP Data Unit) packets. This setting enables the LACP feature.
Passive - The aggregator will not broadcast LACPDU packets, but
it will respond to them. This setting enables the LACP feature.
Manual - Enables static port trunking and disables the LACP
feature.
6. To add or remove a port from a trunk, click the dialog box for the port in
the corresponding trunk row.
A check in a box indicates the port is a member of the trunk. No check
means the port is not a member. A port trunk can contain up to eight
ports.
7. Click Apply.
8. From the main menu on the left side of the page, select Save
Configuration to Flash to permanently save your changes.
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Chapter 6: Static Port Trunking
9. Configure the port trunk on the other switch with the same parameters.
10. Connect the Ethernet cables between trunk ports on the AT-GS950/
16PS switch and the trunk ports on the other switch.
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