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Monitoring and Analyzing Switch Operation
Traffic Mirroring
Switch-A(config)# mirror 2 remote ip 10.10.10.119 9400 10.10.40.1
Caution: Please configure destination switch first.
Do you want to continue [y/n]? y
Switch-A(config)# interface c12 monitor all in mirror 2
IP address of source switch and
UDP port number used in session 2
IP address of remote
destination switch
Monitored
interface
Directional criteria for
selecting all inbound traffic
Mirror
session
Configures all in bound traffic on port C12 (monitored interface) to be mirrored in
session 2.
Configures the IP address and UDP port number on the source switch used to mirror traffic
in session 2, and the IP address of the remote switch with the remote exit port connected
to the traffic analyzer.
1
2
1
2
Figure B-56. Configuring a Remote Mirroring Session for Inbound Port Traffic
Maximum Supported Frame Size
The IPv4 encapsulation of mirrored traffic adds a 54-byte header to each
mirrored frame. If a resulting frame exceeds the MTU (Maximum Transmis-
sion Unit) allowed in the network, the frame is dropped.
Note Mirroring does not truncate frames, and oversized mirroring frames will be
dropped. Also, remote mirroring does not allow downstream devices in a
mirroring path to fragment mirrored frames.
If jumbo frames are enabled on the mirroring source switch, then the mirroring
destination switch and all downstream devices connecting the source switch
to the mirroring destination must be configured to support jumbo frames.
B-92