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

Quick UDLD Question

Can you configure UDLD aggressive on one end and regular UDLD on the other?

Will the switches even accpet it..?

5 REPLIES

Re: Quick UDLD Question

UDLD agressive inteoperates with UDLD normal on the other side of a link.

Francisco

New Member

Re: Quick UDLD Question

OK, so the switches will allow this config.

However, in terms of functionality, the link will not truly be a UDLD aggressive link...it will fallback to UDLD....no?

Re: Quick UDLD Question

I havent tested it myslef but i believe the link with agressive will stay that way and the other side normal. This type of configuration means that just one side of the link will be errdisabled once “Unidirectional” condition has been detected.

Francisco.

Re: Quick UDLD Question

So if one side is agressive and the other side is normal, and the link is determined to be bi-directional and the UDLD information times out while the link on the port is still up, UDLD tries to re-establish the state of the port. If not successful, the port is put into the errdisable state on the aggressive side.

The bahavior of the normal mode, if the link state of the port was determined to be bi-directional and the UDLD information times out, no action is taken by UDLD. The port state for UDLD is marked as undetermined. The port behaves according to its STP state.

Francisco

New Member

Re: Quick UDLD Question

ok, makes sense...thanks

337
Views
5
Helpful
5
Replies