SPAN on Cisco router.

Unanswered Question
May 7th, 2009

Hi all,

is it possible to configure port mirroring in Cisco router?

If no, how can I mirror traffic from one port to other?

Any idea?



I have this problem too.
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johnleeee Fri, 05/08/2009 - 11:03

Hi Frank,

pls could you explain me closer

(or recomend any document)how to do that.

Is it possible to bridge more interfaces to one like in a switch and than plug to that interface monitoring station?



fsebera Fri, 05/08/2009 - 11:17

This is 1 option, there are several others available.

Remember to connect your traffic analyzer to one the interfaces on the router to capture your traffic

Also, you really do not need to trunk the interfaces "encapsulation dot1Q" but here just in case you need to interface with a Cisco switch.

Also additional "direct-to-the-point" help



bridge irb


interface FastEthernet0.100

encapsulation dot1Q 100 Native

bridge-group 1


interface FastEthernet0.200

encapsulation dot1Q 200

bridge-group 1


interface BVI1

ip address


bridge 1 protocol ieee


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