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SG5201-0848-F6 spaning tre problem


Dear all i have a big problem, every seconds my topology changes i think i got spaning tree in some switches, can someone help me how to find it 😞

2017-06-12 17:30:58 Local0 Notice 10.10.7.37 Jun 12 17:30:56 10.10.7.37 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-79-FA-E7) 2017-06-12 17:30:58 Local0 Notice 10.10.7.62 Sep 13 02:51:36 10.10.7.62 NOTICE: Topology changed (Instance:0, Port:28,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:58 Local0 Notice 10.10.7.17 Jun 12 17:30:56 10.10.7.17 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-7A-0B-E1) 2017-06-12 17:30:58 Local0 Notice 10.10.7.64 Apr 3 20:57:59 10.10.7.64 NOTICE: Topology changed (Instance:0, Port:23,MAC:00-17-59-F6-B6-80) 2017-06-12 17:30:58 Local0 Notice 10.10.7.21 Jun 12 17:30:56 10.10.7.21 NOTICE: Topology changed (Instance:0, Port:48,MAC:20-B3-99-7A-11-43) 2017-06-12 17:30:58 Local0 Notice 10.10.7.65 Jun 12 17:30:56 10.10.7.65 NOTICE: Topology changed (Instance:0, Port:28,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:58 Local0 Notice 10.10.7.41 Jun 12 17:30:56 10.10.7.41 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-7A-0A-39) 2017-06-12 17:30:58 Local0 Notice 10.10.7.12 Jun 12 17:30:55 10.10.7.12 NOTICE: Topology changed (Instance:0, Port:48,MAC:20-B3-99-75-2B-81) 2017-06-12 17:30:58 Local0 Notice 10.10.7.25 Jun 12 17:30:55 10.10.7.25 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:58 Local0 Notice 10.10.7.32 Jun 12 17:30:56 10.10.7.32 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-7A-0D-54) 2017-06-12 17:30:57 Local0 Notice 10.10.7.18 Jun 12 17:30:56 10.10.7.18 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.30 Jun 12 17:30:56 10.10.7.30 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.40 Jun 12 17:30:56 10.10.7.40 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.35 Jun 12 17:30:56 10.10.7.35 NOTICE: Topology changed (Instance:0, Port:48,MAC:20-B3-99-72-9E-FE) 2017-06-12 17:30:57 Local0 Notice 10.10.7.36 Jun 12 17:30:55 10.10.7.36 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.28 Jun 12 17:30:56 10.10.7.28 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-7A-14-FD) 2017-06-12 17:30:57 Local0 Notice 10.10.7.20 Jun 12 17:30:56 10.10.7.20 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.43 Jun 12 17:30:55 10.10.7.43 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.59 Jan 8 02:39:25 10.10.7.59 NOTICE: Topology changed (Instance:0, Port:28,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.14 Jun 12 17:30:56 10.10.7.14 NOTICE: Topology changed (Instance:0, Port:24,MAC:20-B3-99-75-1B-90) 2017-06-12 17:30:57 Local0 Notice 10.10.7.16 Jun 12 17:30:56 10.10.7.16 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.26 Jun 12 17:30:56 10.10.7.26 NOTICE: Topology changed (Instance:0, Port:27,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.31 Jun 12 17:30:56 10.10.7.31 NOTICE: Topology changed (Instance:0, Port:48,MAC:20-B3-99-7A-0D-54) 2017-06-12 17:30:57 Local0 Notice 10.10.7.11 Jun 12 17:30:55 10.10.7.11 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.45 Mar 17 03:00:27 10.10.7.45 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.10 Jun 12 17:30:56 10.10.7.10 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:57 Local0 Notice 10.10.7.10 Jun 12 17:30:55 10.10.7.10 NOTICE: Topology changed (Instance:0, Port:51,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:56 Local0 Notice 10.10.7.61 Jun 21 20:20:26 10.10.7.61 NOTICE: Topology changed (Instance:0, Port:28,MAC:02-00-0A-FE-63-0A) 2017-06-12 17:30:56 Local0 Notice 10.10.7.61 Jun 21 20:20:24 10.10.7.61 NOTICE: Topology changed (Instance:0, Port:28,MAC:02-00-0A-FE-63-0A)

2 replies

Userlevel 2
The best resolve this issue is to determine where the topology change (TCN) is being generated.
"show span debug" may help this, another is to disable STP on all uplink ports and then enable it 1 at a time until it breaks again (set spantree portadmin ge.x.x disable:"Keep going downstream until you find the offender and the resolve the STP issue (looped ports?)
Userlevel 7
Hi,

there are a few GTAC Knowledge articles regarding spanning tree topology changes:
The gist is to first configure spanning tree for a stable topology by configuring a dedicated root bridge and manually configuring all access ports to be STP edge ports. After that you can take a closer look at where the remaining topology changes come from.

Thanks,
Erik

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