From: Edwards, Andrew M (andrew.m.edwards@boeing.com)
Date: Thu Jul 22 2004 - 12:07:52 GMT-3
Is the 3rd 3550 connected back to the 6509 distribution switch anywhere?
-----Original Message-----
From: Ted McDermott [mailto:tedmcdermott@yahoo.com]
Sent: Thursday, July 22, 2004 6:43 AM
To: ccielab@groupstudy.com
Subject: Spanning Tree Blocking Mechanism on Cat 3550
We have a cluster of (3) 3550 workgroup switches. The
first 3550 is connected to the root bridge, a 6509
with spantree priority of 8192. The third stacked 3550
is connected to the redundant core 6509 with a
spantree priority of 16384. The two 6509s are
connected with a gig etherchannel set to trunk all
VLANs. Each time we have deployed this configuration,
the 2nd (middle) stacked 3550 switch has automatically
blocked one of its gig ports to avoid a spanning tree
loop. How does this happen, and doesnt this solve the
STP loop issue, without having to turn off trunking
between the cores? Is it recommended to route between
cores rather than trunk?
Thanks!
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