Avaya DLSw User Manual

Configuring DLSw Services

BayRS Version 13.00 Site Manager Software Version 7.00

BCC Version 4.05

Part No. 303523-A Rev. 00 October 1998

4401 Great America Parkway 8 Federal Street Santa Clara, CA 95054 Billerica, MA 01821

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Preface

Before You Begin .............................................................................................................xix

Text Convent io n s ..... ................... ......................................................... ............................xx

Acronyms .........................................................................................................................xxi

Bay Networks Technical Publications .............................................................................xxii

How to Get Help ............................................................................................................xxiii

Chapter 1 Data Link Switching Overview

DLSw Networking Ov e rview .................................... .......................................................1-2

RFC 1795 Support .........................................................................................................1-3

Differences Between RFC 1795 and RFC 1434 ......................................................1-3

DLSw Version 2 Unicast UDP Support ...........................................................................1-4

UDP Explorer Frames ..............................................................................................1-5

TCP, UDP, and Unknown Peer Types .......................................................................1-5

Single TCP/IP Connection .......................................................................................1-6

RFC 2166 Multicast Support ..........................................................................................1-6

Differences Between RFC 2166 and RFC 1795 ......................................................1-6

Configuring IP Multicast Protocols on the Router .................................................... 1-7

Assigning an IP Multicast Group Address to a Slot ..................................................1-7

Sample Connection Using DLSw and IP Multicasting ..............................................1-9

DLSw Single-Switch and Dual-Switch Services ...........................................................1-11

Single-Switch Services ..........................................................................................1-13

FRAD Operation ..............................................................................................1-14

SDLC-to-L LC2 Conversion .............................................. ................................1-14

QLLC-to-L L C2 Con version ............................................................ ..................1-15

Dual-Switch Services .............................................................................................1-15

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SDLC Support ......... ................... .................................................................. ................1-17

Primary SDLC Support .......................................................................................... 1-17

Secondary SDLC Supp or t .....................................................................................1-19

Combining Primary and Secon dary SDLC ........... ...................................... ...........1-21

Frame Relay Support .................................... .. .......... ....... .. .......... ....... ....... .. .......... ......1-22

Boundary Network Node (RFC 1490) .................................................. .. .......... ......1-23

Boundary Access Node . ........................................................................................ 1 -24

QLLC Support ..............................................................................................................1-24

DLSw/APPN Bou ndary Function ........................................ ..........................................1-24

DLSw/APPN Netw o r k Confi g u r a tions .......................... ..........................................1-24

DLSw/APPN Com p onents .....................................................................................1-26

DLSw Backup Peer Suppor t .........................................................................................1-29

DLSw Filtering ..................... .................................................................. .......................1-29

DLSw Prioritizat ion ...... ................... ........................................................ ................1-29

Protocol Prio ritization ........... ............................. .....................................................1-30

For More Information About DLSw ............................................................................... 1 -30

Chapter 2 DLSw Implementation Notes

DLSw and Other Subsyste ms ........................................ ................................................2-1

Combining DLSw and SRB ............................................................................................2-2

Virtual Rings .............................................................................................................2-4

DLSw and SRB on a Circuit .....................................................................................2-5

DLSw and Bridging Services ........... ......................................................... ......................2-6

DLSw on an Ethernet/802.3 Circuit ..........................................................................2-6

DLSw with Translation Bridge ............................................. .......... .. ....... ....... .......... .. ......2-7

Using DLSw Independently of the Translation Bridge . .............................................2-8

Parallel Bridge and DLSw Paths .....................................................................................2-9

Multiple DLSw Peers on a LAN ....................................................................................2-10

Memory Requirements .................................................................................................2-10

TCP Considerations .....................................................................................................2-11

Flow Control .................................................................................................................2-11

LLC2 Flow Control .................................................................................................2 -11

TCP Flow Control ...................................................................................................2 -12

DLSw Flow Contro l ................. ........................................................ .......................2-12

DLSw Pac kaging ........... ............................................... ..........................................2-13

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DLSw Prioritizat ion ................................... ......................................................... ...........2-13

Protocol Prio ritization ........................................... ........................................................2-13

Backup Peers ...............................................................................................................2-14

Chapter 3 DLSw Configuration Overview

Adding Single-Switch DLSw Services ............................................................................3-2

Single-Switch Configuration Requirements ....................................................................3-3

DLSw Basic Global Parameters ...............................................................................3-3

DLSw Virtual Ring ID .........................................................................................3-3

DLSw RFC Version ............................................................................................3-3

NetBIOS Suppor t ...............................................................................................3-3

DLSw Advanced Global Parameters ........................................................................3-3

Virtual Ring MTU ...............................................................................................3-4

Max Slot Sessions .............................................................................................3-4

DLSw SAP Table ............................ ........................................................ ..................3-4

Adding Dual-Switch DLSw Services ...............................................................................3-6

Dual-Switch Configuration Requirements .............................................. .........................3-7

DLSw Basic Global and Basic Interface Parameters ...............................................3-7

DLSw Advanced Global Parameters ........................................................................3-8

TCP Window Size ..............................................................................................3-8

KeepAlive Time ................................................................ ....... ....... .. .......... ....... .3-8

Reject Unconfigured Peers ................................................................................ 3-9

MAC Cache Age ................................................................................................3-9

TCP Inact Time ..................................................................................................3-9

DLSw Slot Table .....................................................................................................3-10

DLSw Peer IP Table ...............................................................................................3-12

Configured Peers .............................................................................................3-12

Peer Types .......................................................................................................3 -13

Backup Peers ...................................................................................................3-14

Simplifying the Peer IP Table ........................................................................... 3 -14

Multicast IP Entries (RFC 2166) .... ..................................................................3-16

Configuring SDLC Lines and Devices ..........................................................................3-17

SDLC Line Parameters ..........................................................................................3 -17

Local Devices .........................................................................................................3-17

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Configuring DLSw over Frame Relay ...........................................................................3-18

Boundary Network Node (RFC 1490) .................................................. .. .......... ......3-19

Boundary Access Node (BAN) . ..............................................................................3-19

Configuring Predefined MACs and Names . ..................................................................3-20

Dynamically Learned Remote Systems .................................................................3-20

Statically Defined Remote Systems .......................................................................3-21

Configuring DLSw Packaging ....................................................................................... 3 -22

Configuring DLSw Prioritization ....................................................................................3-22

Configuring DLSw Backup Peers .................................................................................3-23

Configuring DLSw for IP Multicast ................................................................................3-23

Chapter 4 Starting DLSw

Starting DLSw on an Interface ........................................................................................4-1

Starting DLSw the First Time .........................................................................................4-2

Setting the DLSw Basic Global Parameters ...................................................................4-5

Setting the SRB Basic Global Parameters .....................................................................4-8

Adding Source Routing Parameters for Token Ring .................................................4-9

Adding Source Routing Parameters for Frame Relay BAN ....................................4-10

Setting the DLSw Basic Interface Parameters ..............................................................4-10

Setting the DLSw Basic Interface Parameters for SRB ................................................4 -12

Mapping Frame Relay Addresses .................................................................................4-12

Adding SDLC Line Parameters and Local Devices ...................................................... 4 -15

Configuring the DLSw/APPN Boundary Function ........................................................4-33

Configuring DLSw and APPN ................................................................................4 -33

Creating a Virtual Circuit and Adding a DLSw Interface ........................................4-33

Obtaining the Virtual Circuit Number .....................................................................4-34

Adding an APPN Interface to an Existing Virtual Circuit ........................................4-35

Disabling and Reenabling the Boundary Function .................................................4-36

Configuring DLSw for IP Multicasting ...........................................................................4-36

Chapter 5 Editing DLSw Parameters

Using the Parameter Descriptions ..................................................................................5-1

Accessing DLSw Parameters .........................................................................................5-2

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Editing DLSw Basic Global Parameters .........................................................................5-3

DLSw Basic Global Parameter Descriptions ............................................................5-5

Editing DLSw Basic Interface Parameters ...................................................................... 5-7

Editing the DLSw Advanced Global Parameters ............................................................ 5-9

Enabling a DLSw Interface ........................................................................................... 5 -22

Enabling a DLSw Interface Using the Edit Circuits Function .................................. 5 -25

Editing DLSw Peer IP Table Parameters ......................................................................5-28

Adding a DLSw Peer IP Table Entry .......................................................................5-32

Deleting a DLSw Peer IP Table Entry .....................................................................5-35

Editing the DLSw Slot IP Table .....................................................................................5-36

Adding a DLSw Slot IP Table Entry ........................................................................ 5 -37

Editing a DLSw Slot IP Table Entry ........................................................................5 -39

Deleting a DLSw Slot IP Table Entry ......................................................................5-40

Editing DLSw SAP Table Parameters .................................... .......................................5-41

Adding a DLSw SAP Table Entry .................................... .......................................5-42

Editing a DLSw SAP Table Entry ...........................................................................5-43

Deletin g a DLSw SAP Table Entry ..... ................... .................................................5-45

Editing DLSw Default NetBIOS Peer IP Table Parameters ...........................................5-46

Adding a DLSw Default NetBIOS Peer IP Table Entry ........................................... 5 -47

Editing a DLSw Default NetBIOS Peer IP Table Entry ...........................................5-50

Deleting a DLSw Default NetBIOS Peer IP Table Entry .........................................5-51

Editing DLSw Default MAC Peer IP Table Parameters ................................................. 5 -52

Adding a DLSw Default MAC Peer IP Table Entry .................................................5-54

Editing a DLSw Default MAC Peer IP Table Entry .................................................. 5 -55

Deleting a DLSw Default MAC Peer IP Table Entr y ...............................................5-57

Editing DLSw Local Devices Parameters .....................................................................5-58

DLSw Local Devices Parameter Descriptions ........................................................5 -61

Deleting a DLSw Local Device Entry .....................................................................5-71

Editing a DLSw IP Multicast Entry ................................................................................5-71

Editing DLSw Traffic Filters and Protocol Prioritization .................................................5-76

Deleting DLSw from a Node ......................................................................................... 5 -76

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Chapter 6 Using DLSw Pri ori ti zati on

Protocol Prioritization Overview ......................................................................................6-1

Types of Protocol Prioritization .................................................................................6-2

DLSw Priority Queues ....................................................................................................6-3

Default and Peer-Specific DLSw Queues ................................................................6-3

The Enqueuing Process ........................................................... ....... ....... ..... ....... ......6-3

Nonordered Queues ............................................................... ....... .. .......... ....... .6-4

The Dequeuing Process ...........................................................................................6-4

The Dequeue List ....................................................... ....... ..... ....... ....... ....... ..... .6-5

Weighted Dequeuing Algorithm .........................................................................6-5

Tuning DLSw Protocol Prioritization ...............................................................................6-7

DLSw Priority Queues and Congestion Control .......................................................6-7

Queue Depth ............................................. ......................................................... ......6-7

Configuring Default Priority Queues . ..............................................................................6-8

Enabling the Default Queues for Configured and Unconfigured Peers ....................6-9

Customizing the Default Queue Configuration ................................ ....... ..... ....... ....6-11

DLSw Protocol Prioritization Parameter Descriptions ............................................6-12

Configuring Peer-Specific Priority Queues ...................................................................6-15

Priority Queues for a Specific DLSw Peer ..............................................................6-15

Enabling or Disabling a Single Peer’s Priority Queues ........................................... 6 -19

Customizing Specific DLSw Peer Queues .............................................................6-20

Peer Queue Configuration Parameter Descriptions ...............................................6-21

Creating DLSw Priority Filters ......................................................................................6-22

Using the DLSw Peer Configuration Window ..................................................... ....6-30

Sample Templates for DLSw Protocol Prioritization .....................................................6-31

Appendix A DLSw Default Settings

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Appendix B Criteria for DLSw Prioritization

Predefined DLSw Criteria .............................................................................................. B -2

DLSw Reference Points ................................................................................................. B-2

Specifying MAC Address Ranges ................................................... ....... ....... ..... ....... .....B-4

Source Routing Bridge Source MAC Addresses .....................................................B-4

Source Routing Bridge Functional MAC Addresses .......................................... .....B-5

Specifying Source and Destination SAP Code Ranges ................................................B-5

Appendix C T roubleshooting DLSw

Viewing the DLSw Log ..................................................................................................C-1

Enabling Extended Logging ...........................................................................................C-2

Using and Decoding the DLSw Log ...............................................................................C-3

Sample Log Entries .................................................................................................C-5

Event Code 16 ..................................................................................................C-6

Event Code 17 ..................................................................................................C-6

Event Code 36 ..................................................................................................C-6

Event Code 45 ..................................................................................................C-6

DLSw Session Setup ............................ ........................................................ .................C-7

Establishing DLSw/LLC Connections ............................................................................C-8

Reviewing the Network Log ..................................................................................C-10

Establishing DLSw/SDLC Connections .......................................................................C-11

Reviewing the Network Connection Sequence .....................................................C-13

Disconnecting from the Network ..................................................................................C-14

Troubleshooting DLSw ........................................................ .......... ....... ....... .. .......... .....C-15

Viewing Isolated Problems ....................................................................................C-15

Common DLSw Problems and Nonproblems .......................................................C-17

Common DLSw Problems ..............................................................................C-17

Common DLSw Nonproblems ................................................ .. ....... .......... .....C-20

DLSw Troubleshooting Tables .......... .. ....... .......... ....... .. .......... ....... .. ....... .......... .....C-22

Verifying the WAN Cabling ..........................................................................................C-29

Index

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Figures

Figure 1-1. Addressing a Message to an IP Multicast Group .....................................1-8

Figure 1-2. Receiving a Message Addressed to a Multicast Group ...........................1-9

Figure 1-3. Multicast DLSw ......................................................................................1-10

Figure 1-4. DLSw Single-Switch and Dual Switch-to-Switch Networks ....................1-12

Figure 1-5. Bay Networks Single-Switch Router ......................................................1-14

Figure 1-6. Bay Networks Adjacent Single-Switch Routers .....................................1-15

Figure 1-7. DLSw Dual-Switch Services for SNA Devices on LANs ........................1-16

Figure 1-8. Primary SDLC Routers in Single-Switch DLSw Networks ..................... 1 -18

Figure 1-9. Secondary SDLC Routers in (a) Single- and

(b) Dual-Switch DLSw Networks ............................................................1 -20

Figure 1-10. Combining Primar y and S econdary SDLC ............................................1-21

Figure 1-11. Sample Frame Relay Network ...............................................................1-22

Figure 1-12. Data Center APPN Net w o r k ........................................................... ........1-25

Figure 1-13. Enterprise APPN Network .....................................................................1 -26

Figure 1-14. Boundary Function Virtual Circuit ..........................................................1-27

Figure 1-15. End-to-End Connection Using a DLSw/APPN Router and

a DLSw Router ....................................................................................... 1 -28

Figure 2-1. DLSw-Capable Routers on an IP Backbone ............................................2-3

Figure 2-2. Sample DLSw and SRB Network .............................................................2-4

Figure 2-3. DLSw and Source Route Bridging on SRB Circuits .................................2-6

Figure 2-4. DLSw and Transparent Bridging on Ethernet/802. 3 Circuits ...................2-7

Figure 2-5. Translation Bridge Services ................................... .. ....... ....... .......... .. ......2-8

Figure 2-6. Independent DLSw/Transl ation Bridge Network ......................................2-9

Figure 2-7. DLSw Services in Parallel with a Source Routing Bridge ........................ 2-9

Figure 3-1. DLSw Single-Switch Network Example ...................................................3-2

Figure 3-2. Sample Network with SAP Table Definitions ............................................3-5

Figure 3-3. DLSw Dual-Switch Network Example ......................................................3-6

Figure 3-4. Sample Network with Slot Table Definitions ...........................................3-11

Figure 3-5. Sample Network with Peer IP Table Definitions .....................................3-16

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Figure 4-1. DLSw Basic Global Parameters Window ............................. .. ..... ..... .. ..... .4-6

Figure 4-2. DLSw Basic Global Parameters Window (for SRB) .................................4-9

Figure 4-3. Frame Relay/SNA Connection Window .................................................4-10

Figure 4-4. DLSw Basic Interface Parameters Window ...........................................4-11

Figure 4-5. DLSw Basic Interface Parameters Window (for SRB) ............................4-12

Figure 4-6. LLC2 Frame Relay Mappings Window ...................................................4 -13

Figure 4-7. LLC2 Frame Relay Mapping Add Window .............................................4-13

Figure 4-8. SDLC Line Parameters Window ...........................................................4-15

Figure 4-9. Select Protocols Window .......................................................................4-19

Figure 4-10. DLS Local Device Configuration Window ..............................................4-20

Figure 4-11. Local Device Configuration Window ......................................................4-21

Figure 5-1. Configuration Manager Window ...................................... ....... ..... ....... ......5-3

Figure 5-2. DLSw Basic Global Parameters Window ............................. .. ..... ..... .. ..... .5-4

Figure 5-3. DLSw Basic Interface Parameters ...........................................................5-7

Figure 5-4. Edit DLSw Global Parameters Window ......................... ..... .... ..... ..... .. ..... .5-9

Figure 5-5. DLSw Interface Configuration Window ................................ .. ..... ..... .. ....5-23

Figure 5-6. Circuit List Window ................................................................................5-25

Figure 5-7. Edit Connector Window .........................................................................5-26

Figure 5-8. Circuit Definition Window ....................................................................... 5-26

Figure 5-9. Edit DLSw Interface Window .................................................................5 -27

Figure 5-10. DLSw Peer Configuration Window ......................................... ..... ..... .. ....5-28

Figure 5-11. Add DLSw Pee r Configuration Window ................................................. 5 -33

Figure 5-12. DLSw Slot Configuration Window ..........................................................5-37

Figure 5-13. IP Address in DLSw Slot Configuration Window ................................ ....5-37

Figure 5-14. Saving an Edited DLSw Slot IP Address ...............................................5 -39

Figure 5-15. Deleting a DLSw Slot Table Entry ..........................................................5-40

Figure 5-16. SAP Addresse s in th e DLSw SAP Configuration Window .....................5-42

Figure 5-17. DLSw SAP Parameter Window ..............................................................5-42

Figure 5-18. Sa ving the Edited SAP Window Setting ...................................... ....... ....5-44

Figure 5-19. Deletin g a SAP Table Entry ................................................................ ....5-46

Figure 5-20. DLSw NetBIOS Peer Configuration Window .. ........................................5-47

Figure 5-21. DLSw NetBIOS Configuration Window ..................................................5 -48

Figure 5-22. Saving a DLSw Default NetBIOS Peer IP Table Entry ...........................5-50

Figure 5-23. Deleting a DLSw Default NetBIOS Peer IP Table Entry .........................5 -52

Figure 5-24. DLSw MAC Pe er Configuration Window ................................................5-53

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Figure 5-25. MAC Addresses in the DLSw MAC Configuration Window ....................5-54

Figure 5-26. Saving a DLSw Default MAC Peer IP Table Entry .................................5 -56

Figure 5-27. Deleting a DLSw Default MAC Peer IP Table Entry ...............................5-57

Figure 5-28. DLS Local Device Configuration Window ..............................................5-59

Figure 5-29. DLS Local Device Configuration Add Window .......................................5-60

Figure 6-1. Weighted Bandwidth Allocation ...............................................................6-6

Figure 6-2. Global DLSw PP Parameters/Defaults Window . ......................................6-9

Figure 6-3. Enabling Protocol Prioritization on DLSw Peers ....................................6 -10

Figure 6-4. Enabling Protocol Prioritization for Unconfigured Peers ........................ 6 -10

Figure 6-5. Enabling Protocol Prioritization for All DLSw Peers ...............................6-11

Figure 6-6. Global DLSw PP Parameters/Defaults Window .. ...................................6 -12

Figure 6-7. Peer Queue Configuration Window ........................................................6-16

Figure 6-8. Add/Edit/Delete Queues Window ...........................................................6-17

Figure 6-9. Add Queue Window ...............................................................................6-17

Figure 6-10. Configured Queues ................................................................................ 6 -18

Figure 6-11. Peer Queue Configuration Window with Both Default and

Pee r- Sp e cific Configurations ........ ...................................... ....................6-19

Figure 6-12. Peer Queue Configuration Window ........................................................6-20

Figure 6-13. DLS Priority/Outbound Filters Window ..................................................6-23

Figure 6-14. Filter Template Management Window .................................. ....... ....... ....6-24

Figure 6-15. Selecting a Predefined DLSw Outbound Filter Criterion ........................6 -25

Figure 6-16. Selecting the DLSw Queue Action .................................. ....... .......... ......6-26

Figure 6-17. Queue Number Window .........................................................................6-27

Figure 6-18. Create Filter Window .............................................................................6 -28

Figure 6-19. DLS Priority/Outbound Filters Window with Configured FIlters . ............6-29

Figure 6-20. DLSw Peer Configuration Window ......................................... ..... ..... .. ....6-30

Figure C-1. Sample DLSw/LLC2 Network Connection Seq uence (RFC 1434) ......... C-9

Figure C-2. Sample DLSw/SDLC Network Connection Sequence ..........................C-12

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Tables

Table 4-1. DLSw Start up Screens and Required Parameters .................................4-2

Table 4-2. IDBLOCK Numbers for Switched PUs ..................................... ..... .... ....4-25

Table 5-1. Customizing the DLSw Suppor t Protocols ...............................................5-2

Table 5-2. IDBLOCK Numbers for Switched PUs ..................................... ..... .... ....5-63

Table 6-1. Accessing the DLSw Protocol Prioritization Windows ...........................6-30

Table A-1. DLSw Basic Global Parameters ............................................................A-1

Table A-2. DLSw Basic Interface Parameters ........................................................A-1

Table A-3. DLSw Advanced Global Parameters ..................................................... A-2

Table A-4. DLSw Advanced Interface Parameters ................................................. A-3

Table A-5. DLSw Peer IP Table Parameters ...........................................................A-3

Table A-6. DLSw Slot IP Table Parameters ............................................................A-3

Table A-7. DLSw SAP Parameters ...........................................................................A-4

Table A-8. DLSw Default NetBIOS Peer IP Table Parameters .................................A-4

Table A-9. DLSw Default MAC Peer IP Table Parameters .......................................A-4

Table A-10. DLSw Local Devices Parameters ...........................................................A-5

Table A-11. DLSw Protocol Prioritization Parameters ..............................................A-6

Table A-12. DLSw Multicast Configuration Parameters .............................................A-6

Table B-1. Predefined Outbound Filter Criteria Based on DLSw Header ................ B-2

Table B-2. DLSw Reference Points for FID2 Frames ...............................................B-3

Table B-3. DLSw Reference Points for FID4 Frames ..............................................B-3

Table B-4. Format for Specifying Source-Routing MAC Addresses ......................... B-4

Table B-5. Functional MAC Addresses .................................................................... B-5

Table B-6. SAP Codes .......................................................................... ...................B-6

Table C-1. Extended Logging Comm and s for Subsystems ......................................C-2

Table C-2. Log Messages ................................................... ....... ....... ....... ..... ....... .....C-3

Table C-3. DLSw State Table ...................................................................................C-4

Table C-4. DLSw Event Table ..................................................................................C-4

Table C-5. Common DLSw Problems ....................................................................C-17

Table C-6. DLSw Configuration Troubleshooting ...................................................C-22

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Table C-7. DLSw Interface Troubleshooting ..........................................................C-23

Table C-8. TCP Trouble sh ooting ........... ...................................... ..........................C-24

Table C-9. SNA Troubleshooting ...................................................................... .. ...C-25

Table C-10. NetBIOS Troubleshoot ing ........... ............................ .............................C-26

Table C-11. LLC Troub leshooting .................................................. ..........................C-27

Table C-12. SDLC Troubleshooting .........................................................................C-27

Table C-13. BLN® and BCN® Synchronous Interface Cables .................................C-29

Table C-14. AN®, ARN, ASN™, and EASF Syn chronous Interface Cables ............C-29

Table C-15. Octal Sync Interface Cables ..................................................................C-30

Table C-16. Male No-Modem Cables .................................................................... ...C-30

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This guide describes Data Link Swit chi ng (DLSw) and what you do to start and customize DLSw services on a Bay Networks® router.

Before You Begin

Before using this guide, you must complete the following procedures. For a new router:

• Install the router (see the installation guide that came with your router).

• Connect the router to the network and create a pilot configuration file (see

Quick-Starting Routers, Configuring BayStack Remote Access, or Connecting ASN Routers to a Network).

Preface

303523-A Rev. 00

Make sure that you are running the latest version of Bay Networks BayRS Site Manager software. For information about upgrading BayRS and Site Manager, see the upgrading guide for your version of BayRS.

™

and

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Configuring DLSw Services

Text Conventions

This guide uses the following text conventions:

angle brackets (< >) Indicate that you choose the text to enter based on the

description inside the brackets. Do not type the brackets when entering the command. Example: If the command syntax is:

bold text

<ip_address>

ping ping 192.32.10.12

Indicates text tha t you need to enter and command

, you enter:

names and options. Example: Enter

Example: Use the

show ip {alerts | routes

command.

dinfo

}

braces ({}) Indicate required elements in syntax descriptions

where there is more than one option. You must choose only one of the options. Do not type the braces when entering the command. Example: If the command syntax is:

, you must enter either:

show ip {alerts | routes show ip alerts or show ip routes

}

brackets ([ ]) Indicate optional elements in syntax descriptions. Do

not type the brackets when entering the command. Example: If the command syntax is:

, you can enter either:

show ip interfaces [-alerts show ip interfaces

]

show ip interfaces -alerts

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Preface

italic text Indicates file and directory names, new terms, book

titles, and variables in command syntax descriptions. Where a variable is two or more words, the words are connected by an underscore. Example: If the command syntax is:

show at

valid_route

valid_route>

is one va riable and you subs titu te one value

for it.

screen text Indicates system output , fo r exa mple, prompts and

system messages. Example:

Set Ba y Netw orks Tr ap Mo nito r Fil ters

separator ( > ) Shows menu paths.

Example: Protocol s > IP identifie s the IP option on the Protocols menu.

vertical line (

) Separates choices for command keywords and

arguments. Enter only one of the choices. Do not type the vertical line when entering the command. Example: If the command syntax is:

Acronyms

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, you enter either:

show ip {alerts | rou tes show ip alerts

}

show ip routes

APPN Advanced Peer-to-Peer Networking BAN Boundary Access Node BNI Boundary Node Identifier BNN Boundary Network Node DLSw data link switching DLCI data link connection identifier FDDI Fiber Distributed Data Interface FEP front-end processor FRAD F rame Relay Access Device

, but not both.

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Configuring DLSw Services

FIFO first-in first-out IP Internet Protocol LLC Logical Link Control MAC media access control MTU maximum transmission unit NCP network control program QLLC Qualifi ed Logical Link Control RH request header RIF routing information field RNR receiver not ready RR receiver ready PVC permanent virtual circuit SAP service access point SDLC Synchronous Data Link Control SNA Systems Network Architecture SRB source route bridgi ng SSP Switch-to-Switch Protocol TH transmission header TCP/IP Tra nsmission Control Protocol/Internet Protocol VTAM virtual telecom munications access method XID exchange identification

Bay Netwo rks Technical Publications

You can now print Bay Networks technical manuals and release notes free, directly from the Int ernet. Go to support.bayn etworks.com/libr ary/tpubs/. Fi nd the Bay Networks product for which you need doc umenta tion. Then locate the specific category and model or version for your hardware or software product. Using Adobe Acrobat Reader, you can open the manuals and release note s, sear ch for the sections you need, and print them on most standard printers. You can download Acrobat Reader free from the Adobe Systems Web site, www.adobe.com.

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You can purchase Bay Networks documentation sets, CDs, and selected technic al publications through the Bay Networks Collateral Catalog. The catalog is loc ated on the World Wide Web at support.baynetworks .c om/catalog.html and is divided into sections arran ged alpha betically:

• The “CD ROMs” section lists available CDs.

• The “Guides/Books” section lists books on technical topics.

• The “Technical Manuals” section li sts available print ed documentation sets. Make a note of the part numbers and prices of the items that you want to order.

Use the “Marketing Collateral Catalog description” link to place an order and to print the order form.

How to Get Help

For product assista nce, support contracts, or informati on abou t educational services, go to the following URL:

http://www.baynetworks.com/corporate/contacts/

Preface

303523-A Rev. 00

Or telephone the Bay Networks Technical Solutions Center at: 800-2LANWAN

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Chapter 1

Data Link Switching Overview

This chapter pre sents information about Dat a Link Switching (DLSw), as follows:

• DLSw Networking Overview

• RFC 1795 Support

• DLSw Version 2 Unicast UDP Support

• RFC 2166 Multicast Support

• DLSw Single-Switch and Dual-Switch Services

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• SDLC Support

• Frame Relay Support

• QLLC Support

• DLSw/APPN Boundary Function

• DLSw Backup Peer Support

• DLSw Filtering You should review this chapter if you are responsible for configuring DLSw on

one or more Bay Networks routers. If you are already familiar with DLSw concepts, you can go directly to Chapter 2, “DLSw Implementation Notes,” for more detailed information about DLSw on Bay Networks routers.

1-1

Configuring DLSw Services

DLSw Networking Overview

DLSw provides a standards-based mechanism for reliably transporting connection-orie nted SNA and NetBIOS data across a network. Originally defined in RFC 1434, and currently in RFC 1795 with additional enhancements de fi ned in DLSw Version 2 and RFC 2166, DLSw resolves the issue s associated with transporting SNA and NetBIOS information across a multiprotocol backbone.

Specifically, DLSw:

• Prevents sessions from timing out due to slo w net work response time

• Automatically reroutes traffic around failed links

• Improve s response time by reducing network ove rhead

• Enables multiple loca tions to interconnect without requiring a networ k manager to reconfigure existing bridges

Additionally, the Bay Networks DLSw implementation provides several benefits, including:

• Bay Networks symmetric multi processor architecture, providing a highly scalable and reliab le imple mentation

1-2

• Advanced flow control, ensuring that the router-based network delivers information as relia bly as existing SNA networks

• Integrat ed SDLC-to-LLC2 conversion , en abling the customer to reduce the cost of fr ont-end processor (FEP) ports (for exam ple, 3745), maintenance and software

• RFC 1490 (LLC2 ov er Frame R elay) support, ena bling a Bay Netw orks r outer to communicate across a Frame Relay network directly to a front-end processor or other device that supports this protocol

• DLSw prioritization, allowing preferred DLSw traffic to receive higher priority than other traffic

The Bay Networks DLSw implementation is fu lly interoperable with RFC 1434, RFC 1795, and RFC 2166 DLSw implementations.

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Data Link Switching Overview

DLSw runs on all Bay Networks router platforms using local and wide area network facilities, including:

• LLC2 media, including Ethernet, Token Ring, Frame Relay, and ATM LANE

• Other media using source route bridgi ng (SRB) formats, including FDDI, SMDS, Frame Relay, Point-to-Point (PPP), and ATM (RFC 1483)

• SDLC links in point-to-point and multipoint configurations

• X.25 links using the Qualified Link Level Control (QLLC) protoc ol

You can use DLSw services to support connecti ons between SNA and NetBIOS systems on one type of network (such as Token Ring/802.5) and systems on differ ent types of networks (such as Frame Relay).

In this manual, the term LAN refers to all SRB types of LANs and

Note:

transparent bri dge Ether net/802.3 LANs. SRB LANs include, but are not limited to, T oke n Ring/802.5, FDDI, Ethernet /802.3, SMDS, Frame Relay , and other synchronous media pro tocols. See Configuring Bridging Services for more information on the media that SRB supports.

RFC 1795 Support

RFC 1795, called DLS w Version 1, is an impl ementation o f DLSw de v elope d b y a consortium of vendors. RFC 1795 supersedes the original DLSw specification, RFC 1434. Starting with Version 11.0, Bay Networks DLSw routers support RFC 1795. These routers are fully compatible with Bay Networks routers that support the original RFC 1434 specification with Version 10.0 or earlier software.

Differences Between RFC 1795 and RFC 1434

Based on RFC 1434, RFC 1795 describes features that were not origina lly published, as well as modifications to the standard. RFC 1795 includes:

• Modified frame format for session setup, including a field for the largest frame size.

• Directed b road ca s t CANUREACH and ICANREACH control frames. This feature reduces broadcasting over the network.

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• Capabilities exchange, allowing routers to e xchange resource information about each other. Capabilities exchange flows operate in three categories:

-- Fixed information, such as an organization’s software version

-- Customized informati on, whe re one router transfers the information to

another router

-- Negotiati on, where routers ne gotiate the use of propr ietary functions (and

only if both routers support the functions under negotiation)

• Rate-based pacing, a new standard for flow control between routers. Flow control allows a DLSw router to inform another router to slow down or stop sending data when t he receiving buffer(s) fill up. Rate-based flow control uses a windowing mechanism that allows the routers to send more or fewer packets, based on the state of the last receive window. If the rout er successfully rece ives the last transmission, it informs the sending router to continue to send more packets. Flow control is essential for succ essful delivery of SNA and NetBIOS data.

DLSw Version 2 Unicast UDP Support

1-4

DLSw Version 2 and RFC 2166 are terms that can typically be used interchang ea b ly. However, Bay Ne twork s refers to D LSw Version 2 sligh tly differ ently. Bay Networks implementation, called DLSw Version 2, offers only Unicast UDP suppor t, while the RFC 2166 i mplement ation pr ovide s full multic ast support.

Unicast UDP support is provide d be ginning with BayRS Version 11.02. This implementation allows:

• The initial session est ab lishment request (CanuReach) to be sent via Unicast UDP (as opposed to using TCP as in RFC 1434 and RFC 1795)

• Peer type configur ation (TCP, UDP, and Unkno wn peers)

• You to configure dual uni-directional or single bi-direct ional TCP connections

The DLSw RFC Version parameter allows you to set up your configura tion for DLSw Version 2. A router that you conf igure for DLSw Version 2 can also communicate with routers running RFC 1434 and RFC 1795 implementations.

303523-A Rev. 00

UDP Explorer Frames

If a TCP/IP session is not active, the local router can sen d UDP explor er frames across the network to loca te the destination MAC address. When the local router finds the destin ation MAC address, the destination route r retur ns a UDP response. The local r outer, a s well as the router returning the UPD response, then establish a TCP/IP session between them. Using UDP explorer frames allows the sending router to “explor e” the network before opening a TCP session, keeping a single router av ailable to support a larger networ k.

TCP/IP sessions between route r s establish across the network when a router locates a destinati on MAC address. When established, a TCP/IP session remains activ e between the route rs until there are no r emaining S NA/ NetBIOS sessi ons, or if a TCP connection is idle over a configured time period.

If the local router cannot find the destination MAC address (no UDP response), the local router establishes TCP sessions with all entries in the Peer Table using either RFC 1795 or RFC 1434 protocol standards if the destina tion MAC is an unknown peer type.

Data Link Switching Overview

You can configure DLSw to use UDP explo rer frames to establish TCP/IP sessions with DLSw peers by sett ing the Transport Type parameter.

TCP, UDP, and Unknown Peer Types

With DLSw Version 2 unicast, you can configure DLSw peers as TCP, UDP, or Unknown. If the peer type is unknown, the local router sends UDP explorer frames to establish a connection. If the local router does not receive a UDP response after a numbe r of at tempts, the local router will try to fall back to earlier DLSw RFCs to establish the connection.

If the peer type is TC P, then a TCP connection establishe s when you st art t he local router. If the peer is UDP, a TCP connection establishe s afte r the UDP explorer frames are correctly exchanged.

Refer to Chapter 5 Attempts parameters.

for information on the Tr ansport Type and SNA Fallback

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Configuring DLSw Services

Single TCP/IP Connection

DLSw Version 2 uses a single full-duplex TCP session to transport data. Using a single full-duplex TCP/IP session instead of two half-dupl ex sessions reduces the amount of time and memory required to establish the TCP connection.

RFC 2166 Multicast Support

In addition to IP unicast broad cast se rvices, DLSw provides IP multicast support. The capability to send and receive both IP multicast traffic and IP unicast traf fic makes the Bay Networks implementation of DLSw fully compliant with RFC

2166.

RFC 2166 is an implementation of DLSw that was developed by the APPN Implementors Workshop, a consortium of vendors.

RFC 2166 provides:

• Improve ments for scalability by allowing:

-- The initial session est ab lishment request (CanuReach) to be sent using

Multicast IP

-- Only single bi-directional TCP connection to be used

-- TCP connections to establishe d ( and disconnected) on demand and as

needed

• Reason codes with the HALT_DL and HALT_DL_NOACK SSP messages to provide more diagnostic information

Differences Between RFC 2166 and RFC 1795

The followin g comparison of RFC 2166 with earlier DLSw RFCs 1434 and 1795 shows how RFC 2166 reduces the amount of broadcast traffic on the network.

• Under RFCs 1434 a nd 1795, an end station (an SNA or NetBIOS application) that wants to establish a network connection first sends a DLSw SSP CanuReach (or NETBIOS_NQ) message to all routers that are part of the DLSw network. In a large network with many end stations, these connection attempts result in a lar ge number of packets traveling on the network. In addition, under RFCs 1434 and 1795, TCP connections must be constantly maintained between all participating routers within the DLSw network.

1-6

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+ 262 hidden pages

Avaya DLSw User Manual

Configuring DLSw Services

Contents

Figures

Tables

Before You Begin

Preface

Text Conventions

Acronyms

Bay Netwo rks Technical Publications

How to Get Help

DLSw Networking Overview

RFC 1795 Support

Differences Between RFC 1795 and RFC 1434

DLSw Version 2 Unicast UDP Support

UDP Explorer Frames

TCP, UDP, and Unknown Peer Types

Single TCP/IP Connection

RFC 2166 Multicast Support

Differences Between RFC 2166 and RFC 1795