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
----- = single GigE
=== = dual GigE
The IPD12000 supports EAPS, wish the 3550 did :/
c3550-12G-1#show version
Cisco IOS Software, C3550 Software (C3550-IPSERVICES-M), Version
12.2(25)SEB2, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Tue 07-Jun-05 22:16 by yenanh
ROM: Bootstrap program is C3550 boot loader
c3550-12G-1 uptime is 3 years, 6 days, 5 hours, 44 minutes
System returned to ROM by power-on
System image file is "flash:c3550-ipservices-mz.122-25.SEB2/c3550-
ipservices-mz.122-25.SEB2.bin"
Cisco WS-C3550-12G (PowerPC) processor (revision N0) with 65526K/8192K
bytes of memory.
Processor board ID CAT0916X0XE
Last reset from warm-reset
Running Layer2/3 Switching Image
The 3550 is being used for L2 only, L3 is handled by a 7206 NPE-G1
Here is my config:
spanning-tree mode rapid-pvst
spanning-tree loopguard default
spanning-tree logging
spanning-tree extend system-id
spanning-tree vlan 1-2000 priority 24576
!
interface GigabitEthernet0/4
description Link to NATNMAMA via West route
switchport trunk encapsulation dot1q
switchport mode trunk
flowcontrol send off
mls qos trust dscp
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue queue-limit 50 25 15 10
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
random-detect dscp-based
!
interface GigabitEthernet0/10
description Link to NATNMAMA via East route
switchport trunk encapsulation dot1q
switchport mode trunk
flowcontrol send off
mls qos trust dscp
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue queue-limit 50 25 15 10
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
random-detect dscp-based
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