Impersonation on a T1 with ISDN router

On one of our routers Cisco 2921, we have a Serial Interface with a T1 PRI from a phone company that shows the following:

Serial0/1/1:23 is up, line protocol is up (spoofing)

This does not seem like a problem, but I would like to know if anyone has seen this before and whether it should be active on the 24/7 interface. We were told that it would be on this interface at any time. To my knowledge, the Spoofing is a problem of layer 2 and not a "thing ok. Help, please.

William,

Impersonation on the ISDN T1 just indicates that the interface showed the IOS and is operational.

You worry if you don't see spoofing.

Kind regards
Alex.
Please evaluate the useful messages.

Tags: Cisco Support

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