B-42
Monitoring and Analyzing Switch Operation
Traffic Mirroring
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.
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.
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