According to Cisco documentation, You can only gigastack 9 switches.
However you can have up to 16 switches in a cluster. This makes the Cluster
appear as "one" switch in Visual switch manager, but there are still x
amount of swithces. STP will put a port in a blocking state if you use the
Master Loop Breaker loopback. If you pull an active linke, it will take 30
seconds before the blocking port goes active.
Bryan
"Adrian Chew" <[EMAIL PROTECTED]> wrote in message
8puq1h$bfk$[EMAIL PROTECTED]">news:8puq1h$bfk$[EMAIL PROTECTED]...
> Curious question - anyone knows if a clustered stack of 2900/3500s will
> appear as a single STP bridge to other switches or each cluster switch
> appears as a seperate bridge? I'm guessing each switch is treated as a
> seperate bridge entity for the purposes of STP.
>
> The cause of concern would be if one stacks 16 3500s using Gigastack
> connectors into a cluster, and use the remaining Gig port on the top and
> bottom switches as uplinks, you'd end up with a pretty large STP diameter
> caused by the stacking... assuming the cluster is split right down the
> middle with a port between switches 8 and 9 in blocking state, the maximum
> diameter would be 17? (the 8 switches on either side plus the
> distribution/core switch the stack connects to). If one tunes STP
> accordingly, it would lengthen the network outages during STP convergence.
>
> Any thoughts on this - and designs with stacks of 2900s/3500s that are
> stringed one to another rather than each uplinked seperately to the uplink
> switch?
>
> Regards,
> Adrian
>
>
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