Network technologies and trends

May 6 2013   4:59AM GMT

How to preserve encapsulation across SPAN?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

While any one of you are trying to analyze a SPAN or RSPAN traffic you may notice that certain layer 2 frames are missing. Usually SPAN/RSPAN ignores layer 2 traffic like CDP, spanning-tree BPUDs, VTP, DTP and PagP frames.  However, these traffic types can be forwarded along with the normal SPAN traffic if the “encapsulation replicate” Cisco IOS command is configured in a Cisco Catalyst Switch.

The below example shows how to enable this feature

CiscoSwitch(config)# monitor session 1 source interface g0/1

CiscoSwitch(config)# monitor session 1 destination interface g0/2 encapsulation replicate

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