Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Cisco Phone goes out and locks Network Port

We are having an issue with our Cisco Phones - This affects all models that we have seen (7941,7961,7970, 7937, and 7936 models)  the phone will go out and basically it locks the network port out.  The phone will not reregister till you move it to a different port on the swtich.  Any Ideas out there on why this is going on?


Are you referring to err

Are you referring to err-disabling ports? I would look at port security to begin with. 

Please rate useful posts.

I agreed with George, port

I agreed with George, port security can be best thing to check.

Also check if those ports are not getting a lot number of input errors or CRC.


Best Regards,

Rolando Valenzuela

Cisco Employee

Hi,There is no known issue as


There is no known issue as such, you can check the status messages or the phone console logs on some phones where the issue is likely to happen ( you must have identified a switch by now where it is happening the most ), also check for any switchport errors. Try concentrating on a single site / switch / phone model to begin with to narrow down the issue so that troubleshooting is easy. It may also require packet captures from the switchports where the issue occurs with the captures running all the time until the issue is actually reported. Do check for any recent changes on the network specially any config or ios changes on the switches to which the phones are connected.