cdp enable/disable?

No, you probably don't want to do that. You do have a duplex mismatch between the VOIP phone and the switch. The CDP messages are coming from the phone. The router is displaying them, even though its not the culpret (if the HP switch knew what CDP was, it'll stop them there).

You probably have the phone force set to Full Duplex, which means that auto-negotiation is turned off, which the ethernet spec requires the side that is set to auto-negotiate (the switch) to fallback to half-duplex. Ie. standard duplex mismatch.

Make sure the point where your phone is getting its network info is set to do auto-negoation rather than force duplex. Most likely its TFTP'ing its setup info from the callmanager, although its possible to manually setup the network info in them. Fixup the network settings there, and the messages should go away.

Probably not. I'd guess there's a non-Cisco switch between the phone and the router. The router sees a CDP neighbour reporting a full duplex connection (to the switch) but receives the messages on an interface which is running half duplex. It therefore complains. If there were a CDP-speaking switch between them those particular messages wouldn't get through.

Sam

Lisa,

Most likely you have your Cisco IP Phones connected to non-Cisco switch. CDP protocol usually doesn't cross Cisco switches - it works between two adjacent Cisco devices.

You may be able to shut down these messages - go to the router, go to configuration mode, enter into the E0/0 interface, and issue the command "no cdp log mismatch". Something like:

Router# config t

Router(config)# int e0/0

Router(config-if)# no cdp log mismatch

I don't know what IOS version you are, however it should work.

Good luck,

Mike CCNP, CCDP, CCSP, Cisco Voice, MCSE W2K, MCSE+I, Security+, etc. CCIE R&S (in progress), CCIE Voice (in progress)

------ PC Headset Adapters for Cisco IP Phones