From: Jason Madsen (madsen.jason@gmail.com)
Date: Thu Jul 10 2008 - 17:30:12 ART
cpu utilization isn't too bad...consistently less than 30% on my pc. i do
have numerous redundant links in my topology, but none of the devices really
have any configurations on them other than my "spanning root vlan 1 prio
1600" command on one device. spanning tree normally sets all interfaces to
blk / fwd pretty quickly and remains stable...definitely not the case here.
On Thu, Jul 10, 2008 at 2:22 PM, cciestudy <cciestudy@mid-world.net> wrote:
> You may want to check the CPU utilization. If the CPU utilization is high,
> you see issues like this occur, especially high latency on serial and
> Ethernet interfaces.
>
> Feed it CPU, and check your IDLE PC values.
> Also, avoid windows if you want stability and performance.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Igor
> Manassypov
> Sent: Thursday, July 10, 2008 3:06 PM
> To: Jason Madsen; Cisco certification
> Subject: Re: Spanning Tree in Dynamips
>
> Yep, that will happen if your cpu nears its limit... Was happening on my
> also when I was running it on windows. Scheduling is really bad for these
> things on it. Ideally I would recommend a souped-up linux server with lots
> of ram for it. I am running ie scale labs, and I needed two dual-core
> blades
> with 4gb worth of memory each. Even on those I can tell a slowdown closer
> towards where you enable bgp's...
>
> Jason Madsen <madsen.jason@gmail.com> wrote: 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
>
>
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>
>
>
>
>
>
> Igor M., M.Eng, P.Eng
> Network Architect
>
>
> _______________________________________________________________________
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>
>
> _______________________________________________________________________
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