Spanning Tree in Dynamips

From: Jason Madsen (madsen.jason@gmail.com)
Date: Thu Jul 10 2008 - 16:56:24 ART

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Has anyone experienced instability using Dynamips with constant Spanning
Tree changes e.g. list, lrn, blk, fwd...etc? I believe I'm seeing this
because of the latency associated with running Dynamips on my computer, but
I'm wondering if that's the case or if there's something else inolved
configuration-wise?

here's what I'm seeing on the one device having issues (debug spann
event output):

*Mar 1 00:42:06.955: STP: VLAN1 Fa0/0 -> blocking
R3#
*Mar 1 00:42:30.011: STP: VLAN1 Fa0/0 -> listening
R3#
*Mar 1 00:42:31.927: STP: VLAN1 heard root 32768-cc02.1594.0000 on Fa0/0
*Mar 1 00:42:31.931: current Root has 1600-cc00.1594.0000
R3#
*Mar 1 00:42:32.967: STP: VLAN1 Fa0/0 -> blocking
R3#
*Mar 1 00:42:52.987: STP: VLAN1 Fa0/0 -> listening
*Mar 1 00:42:53.091: STP: VLAN1 heard root 32768-cc02.1594.0000 on Fa0/0
*Mar 1 00:42:53.095: current Root has 1600-cc00.1594.0000
*Mar 1 00:42:53.143: STP: VLAN1 Topology Change rcvd on Fa0/0
*Mar 1 00:42:53.143: STP: VLAN1 sent Topology Change Notice on Fa0/1
R3#
*Mar 1 00:42:54.103: STP: VLAN1 Fa0/0 -> blocking
R3#
*Mar 1 00:43:15.123: STP: VLAN1 Fa0/0 -> listening
*Mar 1 00:43:15.151: STP: VLAN1 heard root 32768-cc02.1594.0000 on Fa0/0
*Mar 1 00:43:15.155: current Root has 1600-cc00.1594.0000
*Mar 1 00:43:15.275: STP: VLAN1 Topology Change rcvd on Fa0/0
*Mar 1 00:43:15.279: STP: VLAN1 sent Topology Change Notice on Fa0/1
R3#
*Mar 1 00:43:16.219: STP: VLAN1 Fa0/0 -> blocking
R3#
*Mar 1 00:43:37.203: STP: VLAN1 Fa0/0 -> listening
*Mar 1 00:43:37.983: STP: VLAN1 heard root 32768-cc02.1594.0000 on Fa0/0
*Mar 1 00:43:37.987: current Root has 1600-cc00.1594.0000
*Mar 1 00:43:38.071: STP: VLAN1 Topology Change rcvd on Fa0/0
*Mar 1 00:43:38.075: STP: VLAN1 sent Topology Change Notice on Fa0/1
R3#
*Mar 1 00:43:38.967: STP: VLAN1 Fa0/0 -> blocking
R3#
*Mar 1 00:44:01.159: STP: VLAN1 Fa0/0 -> listening
*Mar 1 00:44:01.999: STP: VLAN1 heard root 32768-cc02.1594.0000 on Fa0/0
*Mar 1 00:44:02.003: current Root has 1600-cc00.1594.0000
*Mar 1 00:44:02.051: STP: VLAN1 Topology Change rcvd on Fa0/0
*Mar 1 00:44:02.055: STP: VLAN1 sent Topology Change Notice on Fa0/1
R3#
*Mar 1 00:44:02.975: STP: VLAN1 Fa0/0 -> blocking

Jason

• Next message: Igor Manassypov: "Re: How I could see just the EIGRP running configuration"
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