From: Church, Chuck (cchurch@wamnetgov.com)
Date: Thu Jan 15 2004 - 10:34:49 GMT-3
It means that the VLANs with spanning tree disabled won't run it. No problem at all as long as it's loop free. If there's loops (or a possibility of a loop), then you don't want to do it. I'm assuming you don't need more than 64 VLANs on 1 switch (since there's at most 48 ports), so clear VLANs off of the trunks that you know a certain switch won't need.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
> -----Original Message-----
> From: Mike Williams [mailto:ccie2be@swbell.net]
> Sent: Wednesday, January 14, 2004 11:28 PM
> To: CCIELab@Groupstudy.com
> Subject: What happens with too many VLANs?
>
>
> In the production network, we have 2950s that support up to 250 VLANs.
> But they only support 64 separate VLANs running individual instance of
> Spanning Tree....... So my question is what happens when you add that
> 65th VLAN? I partially know the answer is that you will see in the
> config where it says "no spanning-tree vlan <blah>" where
> <blah> is the
> # of the VLAN (or VLANs) over 64. But how do the rest of the switches
> handle this? Do the switches toward the root treat this switch as an
> end-device from a STP perspective?!?!?
>
> Any input is appreciated........ just wondering how to plan
> and what to
> do to make sure nothing breaks now that we've passed 64 (actually 68)
> VLANs on the network........
>
> Thanks!
> Mike W.
>
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