port mirroring on cisco 3845 router

Unanswered Question
Feb 17th, 2009

please i want to mirror fron int g0/0 to fa4/8 on the router.pls i need the config to setup this.i need help

I have this problem too.
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olakunle06 Tue, 02/17/2009 - 11:33

monitor session 1 destination interface fastethernet 4/8

monitor session 1 source interface gigabitethernet0/0 .

but the router is not taking the last command.am mirroring from the ge0/0 interface to fa4/8 on a thesame router 3845.i mean mirroring on thesame router

royalblues Tue, 02/17/2009 - 11:39

Ah... so you have a switch module on the router

i dont think it is poosible to mirror the router fe ports to a switch module connected to the same router..


olakunle06 Tue, 02/17/2009 - 11:50

is it possible to mirror the router Ge port to a Fastethernet switch module connected to the same router 3845

Richard Burts Tue, 02/17/2009 - 11:41


Perhaps I am not understanding something in your request. But port monitoring is a function done on a switch and not on a router. Does this router have a switch module installed as one of its cards?

Perhaps you can supply some additional detail about the router and about what you are trying to do, so that we can understand better and be able to give you better answers.



olakunle06 Tue, 02/17/2009 - 11:47

i have a 16PORT-WIC installed on the router 3845 and i want to mirror from the gigabit interface 0/0 to the one of the ports on the WIC.

i could issue.

monitor session 1 destination source interface fa0/0.

but IOS is not allowing.

monitor session 1 source source interface ge0/0

i dont know why,is this not possible

Tshi M Tue, 02/17/2009 - 11:52

I think that you only can mirror the ports on the 16 ports wic module.

Richard Burts Tue, 02/17/2009 - 12:05


I do not believe that it is possible to mirror from a Gig interface of the router to a switch port on the switch module in the router. That is why the router does not accept the second command.




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