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stp_tcn_errors - high rate of STP topology changes on all switches
Over the Thanksgiving break we suddenly started seeing a high rate of STP topology changes around 5pm on 11/30. We were not in session and no changes or updates were made to the network since before 11/25. Does anyone have any ideas on where else to look? How to troubleshoot if no changes were made on the network, what would cause this problem?
Thank you.
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Hi ,
Where is the root bridge of your topology ? I would look at logs on that device and start from there.
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Hi @allywenzel ,
I do see this type of situation often. Usally something changes to cause this. That log "stp_tcn_error" 'Topology Change Notification". Meaning the Layer 2 path or Spanning Tree is changing where all traffic should go. Most of the time, someone plugged in something. Or in your case, most likley a cable or device is misbehaving.
As @RaphaelL reccomended, check you RSTP Root and make sure it is it is in fact the Root.
Use the following guides to assist in the investigating and mitigation.
https://documentation.meraki.com/MS/Monitoring_and_Reporting/Loop_and_MAC_Flap_Detection_on_MS
Cheers,
Ivan Jukić,
Meraki APJC
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