> Hi Folks,
> I have a design in which Cisco 3548 XL's are GBIC-stacked on various
floors
> of a campus and are uplinked to a core Cat 6509 switch. The uplink from
> every floor stack is ether-channeled to the core via two parallel
equal-cost
> paths. One uplink path starts "forwarding" and the other goes into
> "blocking" mode from each floor stack.
>
> Here is my confusion... If only one link of a 400 MBps full-duplex
> ether-channel fails from the forwarding path , will it invoke
spanning-tree
> recalculation ??? Or will the 'now' sub-optimal path still remain in
> forwarding mode and the now more-bandwidth path remain in blocking mode
???
>

the 'suboptimal' path will continue until all the links fail.  At that
point, STP will detect the link failure and recalculate.

> Since spanning-tree recalculation causes a lot of ripples throughout the
> switched network, I would assume that the latter were true. However, I
would
> like to hear views from people who would think that the former scenario is
> more probable.
>
> Thanks very much.
>
> Aziz
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