Re: UDLD mis-config's

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Sun Jul 06 2008 - 01:47:41 ART

OK, here is the fun part:

1) UDLD aggressive naturally interworks with UDLD normal on the other side,
since it hears back it's echo message. No problems. Just only the agressive
side of the connection would be shut down.

2) If there is no UDLD configured on the other side of a link, then UDLD
status of the link will be "Unknown" and UDLD will *never* err-disable it.
UDLD *only* disables link when the state transitions from "Bi-directional"
to "Uni-directional". And for Bi-directional state to be detected UDLD
should first hear from a peer on the other side.

HTH 

-- 
Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice)
petr@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com

2008/7/5 Tim <ccie2be@nyc.rr.com>:

> Petr,
>
>
>
> One more UDLD question.
>
>
>
> What happens if UDLD is NOT configured on both sides of the link?
>
>
>
> For instance, if UDLD aggressive mode is configured on one side, but not
> (either mode) configured on the other side.  Since the UDLD process on one
> side doesn't hear from the other side,
>
>
>
> will it err-disable the port?
>
>
>
> Also, suppose UDLD aggressive is configured on one side but the peer is
> configured with UDLD normal mode?
>
>
>
> Thanks, Tim

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