SG5201-0848-F6 spaning tre problem

[Shkelqim_Kajtaz]

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)

[Erik_Auerswald]

Hi,

there are a few GTAC Knowledge articles regarding spanning tree topology changes:

• How to troubleshoot spanning tree topology changes on SecureStack, N-Series and S-Series
• SpanningTree Topology Changes Seen From Downstream Device
• Extreme N/S/K/7100-Series or SecureStack Seeing Large Number of Topology Changes
• Spanning Tree Topology Changes on X460

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

[Martineau__John]

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?)