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Spoofing on a ISDN T1 Router

                   On one of our Cisco 2921 Routers we have a Serial Interface with a PRI T1 from a Telco that is showing the following:

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

                    This does not seem like a issue, but I would like to know if anyone has seen this before and if it should be active on the interface 24/7. We were told that this would be on that interface at all times. To my understanding, Spoofing is a layer 2 problem and not a 'ok thing'. Please help.

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Green

Spoofing on a ISDN T1 Router

William,

Spoofing on the ISDN T1 just indicates that the interface has presented itself the IOS and is operational.

Worry when you dont see spoofing.

Regards,
Alex.
Please rate useful posts.

Regards, Alex. Please rate useful posts.
2 REPLIES
Green

Spoofing on a ISDN T1 Router

William,

Spoofing on the ISDN T1 just indicates that the interface has presented itself the IOS and is operational.

Worry when you dont see spoofing.

Regards,
Alex.
Please rate useful posts.

Regards, Alex. Please rate useful posts.
New Member

Spoofing on a ISDN T1 Router

Makes sense now. Thank you.

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