Port Mirroring - Nortel 8300 Troubleshooting Manual

18 Troubleshooting fundamentals
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Port mirroring

Ethernet Routing Switch 8300 switches have a port mirroring feature that
helps you to monitor and analyze network traffic. The port mirroring feature
supports both ingress (incoming traffic) and egress (outgoing traffic) port
mirroring. When you enable port mirroring , the ingress or egress packets of
the mirrored (source) port are forwarded normally and a copy of the packets
is sent out the mirrored port to the mirroring (destination) port. Although you
can configure Ethernet Routing Switch 8300 to monitor both ingress and
egress traffic, some restrictions apply:
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Copyright © 2007, Nortel Networks
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"Port mirroring" (page 18)
"Port statistics" (page 20)
"Route tracing" (page 20)
"Ping snoop" (page 20)
"Log files" (page 21)
"Loopback testing" (page 21)
"System log (syslog)" (page 21)
"Virtual Cable Tester" (page 21)
"System core image dump" (page 22)
"General diagnostic tools " (page 22)
You can configure up to 383 total entries in the port mirroring table for
mirroring, and you can have up to 383 entries active at any given time.
This total is the combination of the maximum number of entries in egress
port mirroring (8) and the number of entries in ingress port mirroring.
For ingress port mirroring, you can only configure one port as the
mirroring (destination) port. You can configure any number of ingress
ports as mirrored (source) ports. Therefore, all ingress mirrored traffic
is sent to the single mirroring (destination) port. Similarly, for egress
mirroring, you can only configure one port as the mirroring (destination)
port. You can configure a maximum of eight ports in egress. For ingress
and egress mirroring, you can configure the mirroring port as the same
port for both ingress and egress mirroring.
Egress port mirroring can be enabled separately, allowing you to monitor
packets as they leave specified ports. In addition, you can monitor traffic
for MAC addresses, where traffic with a given MAC source address (SA)
or MAC destination address (DA) is copied to the specified mirroring
port.
Nortel Ethernet Routing Switch 8300
Troubleshooting
NN46200-704 01.01 Standard
4.0 29 October 2007