Cisco Wireless Troubleshooting – WIPS Alert ‘NoProfile’ Detected on AP

For those interested : the problem was resolved by migrating the core network from an old C6006 to a brand-new Catalyst 6807XL. I guess the polling of ARP information was failing on the old cores. Since migrating every IP for every client has been pulled up, without changing anything to the Prime Infrastructure config.

HTH

Jeremy

Relevant Log messages

Feb  1 03:39:08.338 EST: %IPV6-4-DUPLICATE: Duplicate address FE80::212:44FF:FE4D:4400 on GigabitEthernet8/20
Feb  1 03:39:08.904 EST: %UDLD-SP-4-UDLD_PORT_DISABLED: UDLD disabled interface Gi8/20, transmit/receive loop detected
Feb  1 03:39:08.904 EST: %PM-SP-4-ERR_DISABLE: udld error detected on Gi8/20, putting Gi8/20 in err-disable state

When you see "Duplicate address" and "transmit/recieve loop detected" on the same interface, that's almost a slam-dunk that this is a cabling problem.

Looped circuits are very common when dealing with WAN providers. It typically happens because some technician is testing the circuit with a loop^{Note 1} at their cross-connnect and gets pulled off to perform some other task. However, the loop prevents your circuit from coming up on both sides.

The switch is complaining because it (correctly) considers it a problem when it sees it's own packets received on the interface it was sent from. The best thing to do is work with the provider and tell them you've detected a loop at this location.

If the provider resists (not uncommon), ask them to perform a loop at on their panel at this site towards the other site. If the circuit is indeed correct, you should see your other switch link up (assuming you don't have UDLD on it, as you stated).

After the loop is corrected, just shut/no shut this port to test it again.

This problem illustrates a good use-case for out-of-band connections to your WAN sites through another carrier. This way, if you need to diagnose your far-end circuits, you've got some way to connect to your far-end router / switch.

End Notes

^{Note 1} A loop is just a physical or logical jumper, which connects the Transmit side to the Receive side of the same circuit. This is usually done so a tech can validate the circuit is functional to some demarc point in their network. Ironically, it takes down all connectivity past the loop (until it is removed).