From: Larry Letterman (lletterm@cisco.com)
Date: Thu Dec 18 2003 - 14:48:06 GMT-3
We keep our diameter to 7...and run L3 from the core to the dist
switches.
At the dist points we run stp and keep the dia at 7...keep in mind the
time
Required for a stp recalc...
Larry Letterman
Cisco Systems
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mike Williams
Sent: Thursday, December 18, 2003 5:18 AM
To: dcopleston@manfinancial.com; ccielab@groupstudy.com
Subject: RE: Maximum spanning tree domain size
Well, it's not so much the number of switches, as we have well over 100+
switches all in one STP at one location. I think you're asking about
the STP maximum diameter. Someone else here I'm sure can tell me if
this is right or not, but I seem to recall that you want to keep your
Spanning Tree diameter to 15 or less (no more than 15 layer 2 hops
between any 2 end devices). From the sounds of it, you have all of your
switches connected to one of two core switches (one of which I'm hoping
you've made the spanning tree root) so your network diameter is no more
than 3, so you should be fine.
Mike W.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
dcopleston@manfinancial.com
Sent: Thursday, December 18, 2003 6:14 AM
To: ccielab@groupstudy.com
Subject: Maximum spanning tree domain size
On a large layer 2 network with multiple campus wide VLANs what would
people regard as the maximum number of switches that can stably be used?
Has any one found any documentation stating any such limits. I am
looking at a legacy LAN with over 40 switches in the same STP tree (all
are radiating off 2 core devices in a non-meshed star topology).
In order to help convince management that migrating this to a more
modern multi-layer approach is the way forward I am looking for evidence
showing the weakness of the current approach.
Thanks,
Daniel
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