[c-nsp] LACP and UDLD ?

[Keegan Holley]

On Fri, Nov 12, 2010 at 10:37 AM, Jeff Fitzwater <jfitz at princeton.edu>wrote:

I'm not sure they have the same function.  LACP will just drop the link from
the bundle.  After that you may have a bridging loop anyway, just on a
non-bundled port.  I can't remember exactly how LACP negotiation works, but
things get worse if only one side removes the UD link from the bundle.
 Also, I think UDLD reacts much faster than LACP.

If I am running LACP between two Cisco switches, will it detect a
> unidirectional link (bad fiber one direction), or should I run UDLD also?
>
> I would think LACP would detect a unidirectional link just because of the
> nature of the proto, and take down that channel port.
>
> We may have to channel to a non cisco box, which does not support UDLD, so
> if LACP can deal with a unidirectional link I won't have to worry about
> UDLD.
>
> Thanks,
>
>
>
> Jeff Fitzwater
> OIT Network Systems
> Princeton University
>
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