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

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

For an introduction to the new site, click here. And see here for current known issues.

New Member

errdisable cause loopback

what's the meaning of this error and how can i fix it ?

Thanks

3 REPLIES

Re: errdisable cause loopback

look for a physical loop in ur switch.

there must be some miscabling causing a loop.

Try sh cdp neighbor, and u might just see that on a given port ur neighbor is the switch itself.

HTH

Sam

Re: errdisable cause loopback

Sometimes its caused on the interfaces connected to the IP Phones.

If you find that the cable is fine, disable the keepalive on the switch interface.

-> Sushil

New Member

Re: errdisable cause loopback

I have seen this error on fiber trunks between switches, causing the trunk port to shut down.

According to Cisco, it is caused by a keepalive entering the same port it left from.

As mentioned earlier, removing the keepalive will solve the problem, and is the default (no keepalive) on later OS revisions for the Gigabit ports requiring a GBIC.

2635
Views
0
Helpful
3
Replies