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Posted by cisconwtech on March 9, 2005, 12:29 pm
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Hi,
I am new to this forum but not to Cisco switching. I have a network of
5 Cat400x chassis. I have a (mostly) fully meshed connectivity map,
Switch A is only connected to E and C... it looks like this...
A---------------E
\ / \
\ / \
\ / \
\ / \
\ / \
\ / \
\ / \
C--------------D
\ /
\ /
\ /
\ /
\ /
\ /
\ /
B
In the topology, 'C' is root, with 'D' being the next choice.
Each link is a single-mode fiber pair on an LX Gbic. Here is the
problem.
When the link between C & D was cut, switch D never came up in the
topology. It was unreachable. This happened once before, but we had a
failure of the slotcard that link C-D terminated in on switch 'D'. We
thought the problem then was that the 'D' end of C-D was still thinking
it was in the topology, so the standby links never came up.
However, the recent occurance of this STP failure during a physical
fiber break showed me that it is indeed not functioning correctly.
I am looking for clues as to why the standby links, B-D or E-D did not
restore the topology. All input is welcomed!
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