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.