Panasonic 470 User Manual

Nortel Ethernet Switch 460/470

Conﬁguration — System Monitoring

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NN47210-503 (217107-B)

Document status: Standard Document version: 01.01 Document date: 22 February 2007

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Revision History

Version Reason for revision

01.01

Updated software and document references for Release 3.7 software.

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Preface 11

About this guide 11 Network management tools and interfaces 11 Before you begin 12 Text conventions 12 Related publications 13 Obtaining technical assistance 14

Chapter 1 Network monitoring 15

System Log 15

Port mirroring 17

Port Statistics screen 25

System Log screen 15 Displaying most recent log entry ﬁrst 16

Port-based mirroring conﬁguration 18 Address-based mirroring conﬁguration 19 Port mirroring conﬁguration rules 21 Port Mirroring Conﬁguration screen 22

Chapter 2 Conﬁguring network monitoring using CLI 31

Setting the system event log 31

Enabling remote logging 35

show logging 35 logging remote enable command 36 no logging remote enable command 37 logging remote address command 37 no logging remote address command 37 logging remote level command 38 no logging remote level command 38 default logging remote level command 39

Using port mirroring 39

show port-mirroring command 39 port-mirroring command 40 no port-mirroring command 41

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8 Contents

Displaying port statistics 41

show port-statistics command 42 clear-stats command 43

Chapter 3 Conﬁguring network monitoring using Device

Manager 45

System Log Settings tab 45 Remote System Log tab 47 Graphing chassis statistics 49

IP tab 49 ICMP In tab 53 ICMP Out tab 54

Graphing port statistics 56

Interface tab for graphing ports 57 Ethernet Errors tab for graphing ports 59 Bridge tab for graphing ports 62

Chapter 4 Conﬁguring network monitoring using Web-based

management 65

Viewing the system log 65 Conﬁguring port mirroring 67 Viewing system statistics 71

Viewing port statistics 71 Viewing all port errors 74 Viewing interface statistics 76 Viewing Ethernet error statistics 77 Viewing transparent bridging statistics 79

Monitoring MLT trafﬁc 81

Chapter 5 Conﬁguring RMON using the CLI 83

show rmon alarm 83 show rmon event 84 show rmon history 84 show rmon stats 85 rmon alarm 86 no rmon alarm 87 rmon event 88 no rmon event 88 rmon history 88 no rmon history 89 rmon stats 89 no rmon stats 90

Chapter 6 Conﬁguring RMON using Device Manager 91

Working with RMON information 91

RMON history 92

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Contents 9

Creating a history 92 Disabling history 94 Viewing RMON history statistics 94 Enabling Ethernet statistics gathering 96 Disabling Ethernet statistics gathering 98

RMON Alarms 98

How RMON alarms work 98 Creating alarms 100 Alarm Manager example 100 Viewing RMON statistics 103

RMON events 106

How events work 106 Viewing an event 106 Creating an event 108 Deleting an event 109

RMON Log information 109

RMON tab for graphing ports 110

Chapter 7 Conﬁguring RMON using Web-based management113

Conﬁguring RMON fault threshold parameters 113

Creating an RMON fault threshold 113

Deleting an RMON threshold conﬁguration 116 Viewing the RMON fault event log 117 Viewing RMON Ethernet statistics 118 Viewing RMON history 120

Appendix A Quick steps for port mirroring 123

Conﬁguring port mirroring 123

Index 126

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Preface

About this guide

This guide provides information about system logging, displaying system statistics, and conﬁguring network monitoring on the Nortel Ethernet Switch 460 and Nortel Ethernet Switch 470.

Network management tools and interfaces

The following are the management tools and interfaces available with the switch (for basic instructions on these tools, refer to the Nortel Ethernet Switch 460/470 Overview — System Conﬁguration (NN47210-501)):

•

Console interface The console interface (CI) allows you to conﬁgure and manage the

switch locally or remotely. Access the CI menu and screens locally through a console terminal attached to your Ethernet Switch, remotely through a dial-up modem connection, or in-band through a Telnet session.

•

Web-based management You can manage the network from the World Wide Web and can access

the Web-based Graphical User Interface (GUI) through the HTML-based browser located on your network. The GUI allows you to conﬁgure, monitor, and maintain your network through web browsers. You can also download software using the web.

•

Java-based Device Manager The Device Manager is a set of Java-based graphical network

management applications that is used to conﬁgure and manage Ethernet Switches 460 and 470.

• Command Line Interface (CLI)

The CLI is used to automate general management and conﬁguration of the Ethernet Switches 460 and 470. Use the CLI through a Telnet connection or through the serial port on the console.

•

Any generic SNMP-based network management software

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12 Preface

You can use any generic SNMP-based network management software to conﬁgure and manage Ethernet Switches 460 and 470.

•

Telnet Telnet allows you to access the CLI and CI menu and screens locally

using an in-band Telnet session.

•

SSH Secure Shell (SSH) is a client/server protocol that can provide a secure

remote login with encryption of data, user name, and password. For details on SSH connections, refer to Nortel Ethernet Switch 460/470 Security — Conﬁguration (NN47210-500).

• Nortel Enterprise Policy Manager

The Nortel Enterprise Policy Manager (formerly Optivity Policy Services) allows you to conﬁgure the Ethernet Switches 460 and 470 with a single system.

Before you begin

This guide is intended for network administrators with the following background:

•

Basic knowledge of networks, bridging, and IP

•

Familiarity with networking concepts and terminology

•

Basic knowledge of network topologies

Before using this guide, you must complete the installation procedures discussed in Nortel Ethernet Switch 460-24T-PWR — Installation (NN47210-300) or Nortel Ethernet Switch 470 — Installation (NN47210-301) .

Text conventions

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

braces ({}) Indicate required elements in syntax descriptions

the description inside the brackets. Do not type the brackets when entering the command.

Example: If the command syntax is ip default-gateway <XXX.XXX.XXX.XXX>, you enter

ip default-gateway 192.32.10.12

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

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Related publications 13

Example: If the command syntax is

http-server {enable | disable}

the options are enable or disable.

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

not type the brackets when entering the command.

Example: If the command syntax is

show ip [bootp], you can enter either

show ip or show ip bootp.

plain Courier text

Indicates command syntax and system output.

Example:

TFTP Server IP Address: 192.168.100.15

vertical line | Separates choices for command keywords and

H.H.H. Enter a MAC address in this format

Related publications

For more information about managing or using the switches, refer to the following publications:

•

Release Notes — Software Release 3.7 (NN47210-400)

•

Nortel Ethernet Switch 460-24T-PWR — Installation (NN47210-300)

•

Nortel Ethernet Switch 470 — Installation (NN47210-301)

•

Nortel Ethernet Switch 460/470 Overview — System Conﬁguration (NN47210-501)

arguments. Enter only one of the choices. Do not type the vertical line when entering the command.

Example: If the command syntax is

cli password <serial | telnet>, you must enter either cli password serial or cli password telnet, but not both.

(XXXX.XXXX.XXXX).

• Nortel Ethernet Switch 460/470 Security — Conﬁguration

(NN47210-500)

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14 Preface

•

Nortel Ethernet Switch 460/470 Conﬁguration — Quality of Service and IP Filtering (NN47210-502)

•

Nortel Ethernet Switch 460/470 Conﬁguration — IP Multicast Routing Protocols (NN47210-504)

• Nortel Ethernet Switch 460/470 Conﬁguration — VLANs, Spanning Tree,

and Multilink Trunking (NN47210-505)

•

Installing Gigabit Interface Converters and Small Form Factor Pluggable Interface Converters (312865-B)

You can print selected technical manuals and release notes free, directly from the Internet. Go to w you need documentation. Then locate the speciﬁc category and model or version for your hardware or software product. Use Adobe* Acrobat Reader* to open the manuals and release notes, search for the sections you need, and print them on most standard printers. Go to the Adobe Systems web site to download a free copy of the Adobe Acrobat Reader.

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If you purchased a service contract for your Nortel product from a distributor or authorized reseller, contact the technical support staff for that distributor or reseller for assistance.

ww.nortel.com/support. Find the product for which

If you purchased a Nortel service program, contact one of the following Nortel Technical Solutions Centers:

Technical Solutions Center

Europe, Middle East, and Africa (33) (4) 92-966-968 North America (800) 4NORTEL or (800) 466-7835 Asia Pacific (61) (2) 9927-8800 China (800) 810-5000

Telephone

Additional information about the Nortel Technical Solutions Centers is available from www.nortel.com/callus.

An Express Routing Code (ERC) is available for many Nortel products and services. When you use an ERC, your call is routed to a technical support person who specializes in supporting that product or service. To locate an ERC for your product or service, go to w

ww.nortel.com/erc.

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Chapter 1 Network monitoring

The Ethernet Switches 460 and 470 provide features that allow you to monitor your network, display switch statistics, and log system events.

This chapter discusses the following topics:

•

"System Log" (page 15)

• "Port mirroring" (page 17)

•

"Port Statistics screen" (page 25)

System Log

System Log messages operate as follows:

•

Non-volatile memory messages are retrievable after a system reset.

• Messages can be viewed while the system is operational.

•

All non-volatile and dynamic memory messages are time stamped.

•

When you restart your system after a reset, the dynamic memory messages are deleted.

•

After a reset, all messages stored in non-volatile memory are copied to dynamic memory. The messages copied to dynamic memory are time stamped to zero (0).

•

Starting with Release 3.6 software, Ethernet Switches460 and 470 save the last 100 commands entered to a command history log in NVRAM. This history is periodically copied from NVRAM to the remote syslog server. For details, refer to Nortel Ethernet Switch 460/470 Security — Conﬁguration (NN47210-500).

System Log screen

In the Console Interface, the System Log screen (Figure 1 "System Log

screen" (page 16)) displays or clears messages obtained from system

non-volatile memory or dynamic memory. To open the System Log screen:

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16 Chapter 1 Network monitoring

è Choose Display System Log (or type y) from the main menu.

Figure 1 System Log screen

Displaying most recent log entry ﬁrst

This option allows you to view the system log with the most recent entry displayed ﬁrst; the rest of the log entries are listed in reverse chronological order.

Table 1 "System Log screen ﬁelds" (page 16) describes the System Log

screen ﬁelds.

Table 1 System Log screen ﬁelds

Field Description

Display Messages From This field allows you to select the memory source your messages

are obtained from. Choose Non Volatile, Volatile, or Volatile + Non Volatile. Use the spacebar to toggle between the options.

Default Non Volatile

Range Non Volatile, Volatile + Non Volatile

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Field Description

Port mirroring 17

Display configuration complete?

Clear Messages From This field allows you to clear the information messages from dynamic

This field allows you to determine whether the configuration information received from non-volatile or dynamic memory (depending on what is selected in the Display Messages From field) is complete. Use the spacebar to toggle between the options.

Default No

Range No, Yes

or non-volatile memory or both. If you clear dynamic messages, existing non-volatile messages are copied into dynamic memory. After a system reset, all existing non-volatile messages are copied to dynamic memory. Use the spacebar to toggle between the options.

Default None

Range None, Non Volatile, Volatile + Non Volatile

Port mirroring

You can designate one of your switch ports to monitor trafﬁc on any two speciﬁed switch ports (port-based) or to monitor trafﬁc to or from any two speciﬁed addresses that the switch has learned (address-based).

The following sections provide sample conﬁgurations using the Console Interface for both monitoring modes available with the port mirroring feature:

•

Port-based mirroring

•

Address-based mirroring

A sample Port Mirroring Conﬁguration screen accompanies each network conﬁguration example. Notethat the examples do not show all of the screen prompts that precede some actions.

Note: Use the CI menus, the CLI, or the Web-based management system to conﬁgure port mirroring.

For example, when you conﬁgure a switch for port mirroring or when you modify an existing port mirroring conﬁguration, the new conﬁguration does not take effect until you respond [Yes] to the following screen prompt:

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18 Chapter 1 Network monitoring

Port-based mirroring conﬁguration

Figure 2 "Port-based mirroring conﬁguration example" (page 18) shows an

example of a port-based mirroring conﬁguration where port 23 is designated as the monitor port for ports 24 and 25 of Switch S1. Although this example shows ports 24 and 25 monitored by the monitor port (port 23), any of the trunk members of T1 and T2 can also be monitored.

In this example, port X and port Y are members of Trunk T1 and Trunk T2. Port X and port Y are not required to always be members of Trunk T1 and Trunk T2.

Note: Trunks cannot be monitored and trunk members cannot be conﬁgured as monitor ports (see Nortel Ethernet Switch 460/470

Conﬁguration — VLANs, Spanning Tree, and Multilink Trunking (NN47210-505) for details).

Figure 2 "Port-based mirroring conﬁguration example" (page 18) shows the

Port Mirroring Conﬁguration screen setup for this example.

Figure 2 Port-based mirroring conﬁguration example

In the conﬁguration example shown in Figure 2 "Port-based mirroring

conﬁguration example" (page 18), the designated monitor port (port 23) can

be set to monitor trafﬁc in any of the following modes:

•

Monitor all trafﬁc received by port X.

•

Monitor all trafﬁc transmitted by port X.

•

Monitor all trafﬁc received and transmitted by port X.

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Port mirroring 19

•

Monitor all trafﬁc received by port X or transmitted by port Y.

•

Monitor all trafﬁc received by port X (destined to port Y) and then transmitted by port Y.

•

Monitor all trafﬁc received/transmitted by port X and transmitted/received by port Y (conversations between port X and port Y).

As shown in the Port Mirroring Conﬁguration screen example (Figure 3 "Port

Mirroring Conﬁguration port-based screen example" (page 19)), port 23 is

designated as the Monitor Port for ports 24 and 25 in Switch S1.

Note: The Unit value (in the Unit/Port ﬁeld) is not conﬁgurable when the switch is operating.

The Monitoring Mode ﬁeld [ - > Port X or Port Y - > ] indicates that all trafﬁc received by port X

or all trafﬁc transmitted by port Y is currently being

monitored by the StackProbe attached to Monitor Port 23. The screen data displayed at the bottom of the screen shows the currently

active port mirroring conﬁguration.

Figure 3 Port Mirroring Conﬁguration port-based screen example

Address-based mirroring conﬁguration

Figure 4 "Address-based mirroring conﬁguration example" (page 20) shows

an example of an address-based mirroring conﬁguration where port 23, the designated monitor port for Switch S1, is monitoring trafﬁc occurring between address A and address B.

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20 Chapter 1 Network monitoring

Figure 4 Address-based mirroring conﬁguration example

In this conﬁguration, the designated monitor port (port 23) can be set to monitor trafﬁc in any of the following modes:

•

Monitor all trafﬁc transmitted from address A to any address.

•

Monitor all trafﬁc received by address A from any address.

•

Monitor all trafﬁc received by or transmitted by address A.

•

Monitor all trafﬁc transmitted by address A to address B.

• Monitor all trafﬁc between address A and address B (conversation

between the two stations).

Figure 5 "Port Mirroring Conﬁguration address-based screen example" (page 21) shows the Port Mirroring Conﬁguration screen setup for this

example. In this example, port 23 becomes the designated Monitor Port for Switch S1

when you press Enter in response to the [Yes] screen prompt.

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Note: The screen data displayed at the bottom of the screen changes to show the new currently active port mirroring conﬁguration after you press Enter.

The Monitoring Mode ﬁeld [ Address A - > Address B ] indicates that all trafﬁc transmitted by address A to address B is monitored by the StackProbe attached to Monitor Port 23.

Note: When you enter MAC addresses in this screen, they are also displayed in the MAC Address Table screen EAPOL.

Figure 5 Port Mirroring Conﬁguration address-based screen example

Port mirroring 21

Port mirroring conﬁguration rules

The following conﬁguration rules apply to any port mirroring conﬁguration:

•

You cannot conﬁgure a monitor port as a trunk member or IGMP member.

•

A monitor port cannot be used for normal switch functions.

•

When you conﬁgure a port as a monitor port, the port is automatically disabled from participating in the spanning tree. When you reconﬁgure the port as a standard switch port (no longer a monitor port), the port is enabled for spanning tree participation.

•

When you create a port-based port mirroring conﬁguration, be sure that the monitor port and both of the mirrored ports, port X and port Y, have the same conﬁguration. Use the VLAN Conﬁguration screen to conﬁgure the VLAN EAPOL.

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22 Chapter 1 Network monitoring

•

VLAN conﬁguration settings for any ports conﬁgured for port-based mirroring cannot be changed. Use the Port Mirroring Conﬁguration screen to disable port mirroring (or reconﬁgure the port mirroring ports), then change the VLAN conﬁguration settings.

•

For port-based monitoring of trafﬁc, use one of the following modes for monitoring broadcast, IP Multicast, or unknown DA frames:

— Monitor all trafﬁc received by port X. — Monitor all trafﬁc transmitted by port X. — Monitor all trafﬁc received and transmitted by port X.

Appendix "Quick steps for port mirroring" (page 123) also provides

conﬁguration ﬂowcharts that can help you use this feature.

Port Mirroring Conﬁguration screen

The Port Mirroring Conﬁguration screen allows you to conﬁgure a speciﬁc switch port to monitor up to two speciﬁed ports or two MAC addresses. You can specify port-based monitoring or address-based monitoring.

Figure 6 "Port Mirror Conﬁguration screen" (page 22) shows an example of

a Port Mirroring Conﬁguration screen. To open the Port Mirroring Conﬁguration screen: è Choose Port Mirroring Conﬁguration (or type i) from the Switch

Conﬁguration Menu screen.

Figure 6 Port Mirror Conﬁguration screen

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Table 2 "Port Mirroring Conﬁguration screen ﬁelds" (page 23) describes the

Port Mirroring Conﬁguration screen ﬁelds.

Table 2 Port Mirroring Conﬁguration screen ﬁelds

Field Description

Port mirroring 23

Monitoring Mode

Monitor Unit/Port

Unit/Port X

Allows a user to select any one of six port-based monitoring modes or any one of five address-based monitoring modes (see Table

3 "Monitoring modes" (page 24)). Selecting any one of the six

port-based modes activates the port X and port Y screen fields, where a user can choose up to two ports to monitor. Selecting any one of the five address-based modes activates the Address A and Address B screen fields, where a user can specify MAC addresses to monitor.

Default Value: Disabled Range: See Table 3 "Monitoring modes" (page 24) Indicates the port number (of the specified unit) that is designated

as the monitor port. Default Value: Zero-length string Range: 1 to 8 or 1 to 26 (depending on model type) Indicates one of the ports (of the specified unit) that is monitored by

the designated port monitor when one of the port-based monitoring modes is selected.

This port is monitored according to the value of Port X in the Monitoring Mode field (see Table 3 "Monitoring modes" (page 24)).

Default Value: Zero-length string Range: 1 to 8 or 1 to 26 (depending on model type)

Unit/Port Y

Indicates one of the ports (of the specified unit) that is monitored by the designated port monitor when one of the port-based monitoring modes is selected. When installed as a stand-alone switch, the screen does not display the (Unit/) field designation. This port is monitored according to the value of Port Y in the Monitoring Mode field (see Table 3 "Monitoring modes" (page 24)).

Default Value: Zero-length string Range: 1 to 8 or 1 to 26 (depending on model type)

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Field Description

Address A

Indicates the MAC addresses that is monitored by the designated port monitor when one of the address-based monitoring modes is selected. This port is monitored according to the value of Address A in the selected Monitoring Mode field (see Table 3 "Monitoring

modes" (page 24)).

Default Value: 00-00-00-00-00-00 (no MAC address assigned) Range: 00-00-00-00-00-00 to FF-FF-FF-FF-FF-FF

Address B

Indicates the MAC addresses that is monitored by the designated port monitor when one of the address-based monitoring modes is selected. This port is monitored according to the value of Address B in the selected Monitoring Mode field (see Table 3 "Monitoring

modes" (page 24)).

Default Value: 00-00-00-00-00-00 (no MAC address assigned) Range: 00-00-00-00-00-00 to FF-FF-FF-FF-FF-FF

Table 3 "Monitoring modes" (page 24) describes the various monitoring

modes available from the Port Mirroring Conﬁguration screen.

Table 3 Monitoring modes

Field Description

Port-based: Disabled Default value for this feature.

-> Port X Monitor all traffic received by Port X. Port X -> Monitor all traffic transmitted by Port X. <-> Port X Monitor all traffic received and transmitted by Port X.

-> Port X or Port Y -> Monitor all traffic received by Port X or transmitted by Port Y.

Note: Do not use this mode for broadcast or multicast traffic.

-> Port X and Port Y -> Monitor all traffic received by Port X (destined to Port Y) and then transmitted by Port Y.

Note: Do not use this mode for broadcast or multicast traffic

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Field Description

<-> Port X and Port Y <-> Monitor all traffic received/transmitted by Port X and

received/transmitted by Port Y.

Note: Do not use this mode for broadcast or multicast

traffic Address-based: Disabled Default value for this feature. Address A -> any Address Monitor all traffic transmitted from Address A to any

address. any Address -> Address A Monitor all traffic received by Address A from any address. <-> Address A Monitor all traffic received by or transmitted by Address A. Address A -> Address B Monitor all traffic transmitted by Address A to Address B. Address A <-> Address B Monitor all traffic between Address A and Address B

(conversation between the two stations).

Port Statistics screen

The Port Statistics screen, as displayed in Figure 7 "Port statistics screen"

(page 26), allows you to view detailed information about any switch or port

in a conﬁguration. The screen is divided into two sections (Received and Transmitted) so that you can compare and evaluate throughput or other port parameters. All screen data is updated approximately every 2 seconds.

You can use the Port Statistics screen to clear (reset to zero) port counters for a speciﬁc switch or port. Alternatively, you can use the Clear All Port Statistics option to clear port counters for all switches or ports.

To open the Port Statistics screen: Choose Display Port Statistics (or type d) from the Switch Conﬁguration

Menu screen.

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Figure 7 Port statistics screen

Table 4 "Port Statistics screen ﬁelds" (page 26) describes the Port Statistics

screen ﬁelds.

Table 4 Port Statistics screen ﬁelds

Field Description

Port Allows you to select the number of the port you want to view or reset

to zero.

To view another port, enter its port number and press Enter, or press the spacebar on your keyboard to toggle the port numbers.

Packets Received column: Indicates the total number of packets received on

this port, including bad packets, broadcast packets, and multicast packets.

Transmitted column: Indicates the total number of packets transmitted successfully on this port, including broadcast packets and multicast packets.

Multicasts Received column: Indicates the total number of good multicast

packets received on this port, excluding broadcast packets.

Transmitted column: Indicates the total number of multicast packets transmitted successfully on this port, excluding broadcast packets.

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Field Description

Broadcasts Received column: Indicates the total number of good broadcast

packets received on this port.

Transmitted column: Indicates the total number of broadcast packets transmitted successfully on this port.

Total Octets Received column: Indicates the total number of octets of data

(including data in bad packets) received on this port, excluding framing bits but including FCS octets.

Transmitted column: Indicates the total number of octets of data transmitted successfully on this port, including FCS octets.

Lost Packets Received column: Indicates the total number of packets lost

(discarded) when the capacity of the port receive buffer was exceeded.

Transmitted column: Indicates the total number of packets lost (discarded) when the capacity of the port transmit buffer was exceeded.

Packets 64 bytes Received column: Indicates the total number of 64-byte packets

received on this port.

Transmitted column: Indicates the total number of 64-byte packets transmitted successfully on this port.

65-127 bytes Received column: Indicates the total number of 65-byte to 127-byte

packets received on this port.

Transmitted column: Indicates the total number of 65-byte to 127-byte packets transmitted successfully on this port.

128-255 bytes Received column: Indicatesthe total number of 128-byte to 255-byte

packets received on this port.

Transmitted column: Indicates the total number of 128-byte to 255-byte packets transmitted successfully on this port.

256-511 bytes Received column: Indicatesthe total number of 256-byte to 511-byte

packets received on this port.

Transmitted column: Indicates the total number of 256-byte to 511-byte packets transmitted successfully on this port.

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Field Description

512-1023 bytes Received column: Indicates the total number of 512-byte to

1023-byte packets received on this port.

Transmitted column: Indicates the total number of 512-byte to 1023-byte packets transmitted successfully on this port.

1024-1518 bytes Received column: Indicates the total number of 1024-byte to

1518-byte packets received on this port.

Transmitted column: Indicates the total number of 1024-byte to 1518-byte packets transmitted successfully on this port.

Frame Errors Indicates the total number of valid-size packets received but

discarded because of CRC errors and improper framing.

Undersized Packets Indicates the total number of packets received on this port with

fewer than 64 bytes and with proper CRC and framing (also known as short frames or runts).

Oversized Packets Indicates the total number of packets received on this port with more

than 1518 bytes and with proper CRC and framing (also known as

oversized frames). Filtered Packets Indicates the number of packets filtered (not forwarded) by this port. Flooded Packets Indicates the total number of packets flooded (forwarded) through

this port because the destination address was not in the address

database. FCS Errors Indicates the total number of valid-size packets received with proper

framing but discarded because of cyclic redundancy check (CRC)

errors. Collisions Indicates the total number of collisions detected on this port. Single Collisions Indicates the total number of packets transmitted successfully on

this port after a single collision. Multiple Collisions Indicates the total number of packets transmitted successfully on

this port after more than one collision. Excessive Collisions Indicates the total number of packets lost on this port due to

excessive collisions. Deferred Packets Indicates the total number of frames delayed on the first transmission

attempt, but that never incurred a collision. Late Collisions Indicates the total number of packet collisions that occurred

after a total length of time that exceeded 512 bit-times of packet

transmission.

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Field Description

The following field values appear only when the port selected in the Unit/Port field is configured with a GBIC.

Pause Frames Transmitted column: Indicates the total number of pause frames

transmitted on this port. Pause frames cause the transmitting port

to temporarily suspend the transmission of packets when the frame

buffer of the receiving port is full (Gigabit ports only).

Received column: Indicates the total number of pause frames

received on this port. Pause frames cause the transmitting port to

temporarily suspend the transmission of packets when the frame

buffer of the receiving port is full (Gigabit ports only).

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