Configuring And Monitoring Port Mirroring Using The Cli - Nortel 8300 Troubleshooting Manual

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Configuring and monitoring port mirroring using the CLI
Set up port mirroring using the config diag commands. For example, to
monitor port 9/2 with output on port 9/3, use the following commands:
config diag mirror-by-port 1 create in-port 9/2 out-port 9/3
config diag mirror-by-port 1 enable true
Nortel recommends that you disable port mirroring when not in use to reduce
the load on the switch.
Prerequisites
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Copyright © 2007, Nortel Networks
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Show port-mirroring
If you are using a network sniffer, connect the sniffer to port 9/3.
To avoid seeing unintended traffic, remove the mirroring (destination)
port from all VLANs and spanning tree groups (STGs).
You can configure one mirror port and up to 10 monitor ports.
"Displaying port mirroring settings" (page 59)
"Configuring mirror-by-port entries" (page 59)
"Creating a new mirror-by-port table entry" (page 59)
"Deleting mirror-by-port entries" (page 60)
"Enabling a mirroring port" (page 61)
"Configuring the mirrored port and mirroring port" (page 61)
"Configuring the mirror-by-port mode" (page 62)
"Displaying mirrored port information" (page 62)
Nortel Ethernet Routing Switch 8300
Troubleshooting
NN46200-704 01.01 Standard
4.0 29 October 2007
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