topic Re: Spanning-Tree Topology Changes on 4108gl in Switches, Hubs, and Modems

Spanning-Tree Topology Changes on 4108gl

seymour999 — Fri, 14 Nov 2003 13:11:30 GMT

Have a pair of 4108gls interconnected by two 1000TX trunks, both of which run G.04.05 firmware.

The root switch reports a topology change about 6 times/hour (in Topology Change Count).
There doesn't appear to be any reason for these - none of the usual events that trigger topology changes is occurring.
Further, an analyzer attached to the root switch never sees a Topology Change broadcast,
only Configuration broadcasts.

Welcome any insights.

Re: Spanning-Tree Topology Changes on 4108gl

seymour999 — Fri, 14 Nov 2003 13:17:49 GMT

Omitted to mention that the underlying concern is these switches appear to be flooding a lot of traffic. And increasing the MAC aging time doesn't appear to help.

Re: Spanning-Tree Topology Changes on 4108gl

SCOOTER — Tue, 18 Nov 2003 11:48:08 GMT

Hi,

Are you using STP or RSTP? I would first of all suggest a firmware upgrade anyway. In RSTP these messages appear when a non edgeport change the status.

Kind regards,

SCOOTER

Re: Spanning-Tree Topology Changes on 4108gl

seymour999 — Tue, 18 Nov 2003 11:58:11 GMT

Thanks, Scooter.

We're using IEEE STP because there is a Cisco 2924 switch connected to the second 4108. Firmware upgrade is scheduled for tonight.

Re: Spanning-Tree Topology Changes on 4108gl

seymour999 — Wed, 19 Nov 2003 07:46:40 GMT

Upgrading the firmware fixed this.

Flooding has stopped and and no topology changes occurred in past 10 hours (compared to 6 changes/hr before).

Re: Spanning-Tree Topology Changes on 4108gl

Erik Ibsen_3 — Fri, 21 Nov 2003 12:43:15 GMT

I was just going through the HP 2524 FAQ, and I found the answer to the problem you were having. I just thought I'd add it here, as it's nice to see things on paper:

ftp://ftp.hp.com/pub/networking/software/59903102-E2.pdf

There's a section near the end of the document in the FAQ that covers STP.