Matthew Crocker wrote:
I'm sure I'm being stupid here but I can't figure out what is going on.
I have 2 switches connected together via 2 GigE links, they are not
bonded (no EtherChannel). I want link one to act as a backup to the
other link. I don't care which link is primary
one switch is a 3550-12G the other is a Paradyne IPD12000E 'dslam'.
When I connect both GigE links the traffic starts looping and in about
30-40 seconds the 3550 melts and I lose console access/response.
yanking either of the links restores everything instantly. I'm sure
it is a spanning tree problem but isn't looping exactly what it is
supposed to detect and protect against?
The 3550-12G should always be the spanning tree route.
Topology is
7206 ---- 3550-12G ==== Paradyne IPD12000E ----- Paradyne IPD12000E
suggest you open a support case with Paradyne, by the sounds of it, no
STP is running at all, its not responding to/generating BPDUs. does it
support RPVST?
you can perhaps diagnose a bit more by bringing up the link between the
3550 and it with just one GbE and then inspecting STP status on c3550
with "show spanning-tree ..".
make sure that it is bringing up the link as a bridge port & not access
port.
cheers,
lincoln.
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