Chapter 6
| Address Table Settings
Configuring MAC Address Mirroring
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Figure 98: Clearing Entries in the Dynamic MAC Address Table
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.
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 “Spanning Tree Algorithm” on
page 179).
◆ When mirroring VLAN traffic (see “Configuring VLAN Mirroring” on page 162) 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 99).
◆ 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: 1-12/28)
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