User guide

756 Brocade 6910 Ethernet Access Switch Configuration Guide

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Configuring MAC Address Mirroring

Use the MAC Address > Mirror (Add) page to mirror traffic matching a specified source address

from any port on the switch to a target port for real-time analysis. You can then attach a logic

analyzer or RMON probe to the target port and study the traffic crossing the source port in a

completely unobtrusive manner.

CLI References

• “Local Port Mirroring Commands” on page 301

Command Usage

• When mirroring traffic from a MAC address, ingress traffic with the specified source address

entering any port in the switch, other than the target port, will be mirrored to the destination

port.

• All mirror sessions must share the same destination port.

• Spanning Tree BPDU packets are not mirrored to the target port.

• When mirroring port traffic, the target port must be included in the same VLAN as the source

port when using MSTP (see “” on page 759).

• When mirroring VLAN traffic (see “Configuring VLAN Mirroring” on page 746) or packets based

on a source MAC address, the target port cannot be set to the same target ports as that used

for port mirroring (see “Configuring Local Port Mirroring” on page 679).

• When traffic matches the rules for both port mirroring, and for mirroring of VLAN traffic or

packets based on a MAC address, the matching packets will not be sent to target port

specified for port mirroring.

Parameters

These parameters are displayed:

• Source MAC – MAC address in the form of xx-xx-xx-xx-xx-xx or xxxxxxxxxxxx.

• Target Port – The port that will mirror the traffic from the source port. (Range: 1-12)

Interface

To mirror packets based on a MAC address:

1. Click MAC Address, Mirror.

2. Select Add from the Action list.

3. Specify the source MAC address and destination port.

4. Click Apply.