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High Rate of STP Topology Changes

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High Rate of STP Topology Changes

I get "High Rate of STP Topology Changes" on all of my Meraki Core switchports that are connected to other non-Meraki switches. Should I be concerned and what would be my next steps in troubleshooting this? 

Head in the Cloud

Re: High Rate of STP Topology Changes

I'd, first of all, understand your STP topology and then work backwards from there. Do you have the Layer 2/STP topology diagramed/documented at all?
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Meraki Employee

Re: High Rate of STP Topology Changes

Agreed, I'd confirm all of the physical connectivity and do some quick packet captures or work with Support to find the source(s) of the TCN BPDUs and start from there, possibly even temporarily admin-downing certain redundant/blocking links to isolate the issue.

Kind of a big deal

Re: High Rate of STP Topology Changes

Have you configured the root priority for the switch that should be the core of your network?


Next the other switches, what are they?  If they are Cisco Enterprise switches I would configure them to use mst "spanning-tree mode mst".

If they are dumb layer 2 switches it is possible they don't even run spanning tree.


Look for links between edge/leaf switches that should be there.  You ideally want a loop free design where the downstream switches only connect to the core switch and no other switches.

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