Your understanding is correct, as far as the information you've given goes.
However, presumably you are running multiple VLANs in this setup?
If you are using per-VLAN spanning tree, you have a separate spanning tree for
each VLAN. You can set 6500a to be the root bridge for some of the VLANs, and
6500b to be the root bridge for the other VLANs. Then, although each particular
spanning tree uses one switch, your total traffic will be balanced across both.
If one falls over, spanning tree for the affected VLANs swaps across to the
remaining 6500.
Anyway, whether it's a waste of dollars to have a switch sitting there in case
of failure depends on how much the failure will cost you if the second switch
isn't there :-)
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 16/08/2000 04:26 pm
---------------------------
"Rick Holden" <[EMAIL PROTECTED]> on 16/08/2000 01:23:36 pm
Please respond to "Rick Holden" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: STP
I have a question on Spanning tree across the core layer. If I have switch
stacks that look like the following diagram:
2924 2924 2924 2924 2924 2924 2924 2924 2924
2924 2924 2924 2924 2924 2924 2924 2924 2924
2924 2924 2924 2924 2924 2924 2924 2924 2924
2924 2924 2924 2924 2924 2924 2924 2924 2924
5000 5000 5000 5000 5000 5000 5000 5000 5000
6500a 6500b
If I have two links going to each 6500 from the 5000s and the 6500a switch
is the root bridge, then is 6500b switch even going to be used. From my
understanding of STP, all traffic is going to go through the root bridge in
the even of redundant paths. If this is true then (not that I am downing
fault tolerance) it is a waste of a switch that costs thousands of dollars
just to sit there and wait for the 6500a switch to go down. Am I getting
this correct or is there a way to setup STP so both 6500s get used with
about the same load?
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