STP Issues

[JustinGA]

Hi everyone, hoping for some help, guidance.

I have a mix network of catalyst 2960s and MS250 / 120 switches.

My MS250s that are plugged into 9372 Core 1 always have a High Rate of STP topology changes on port XX..

When I plug them into 9372 Core 2 they don't.

Core 1 is my root bridge.

I'm not sure how to tackle this as it doesnt seem to be harming anything, but I dont have it in me to stop trying to fix it.

I have attached a bad depiction of my network in below:

[alemabrahao]

Have you tried using MSTP on Catalyst switches and 9300?

[JustinGA]

no, too be honest.. im not familiar with that or how it would be configured.

[JustinGA]

@alemabrahao have you experienced this kind of thing before? I took over this from over 10 years of other people blindly setting things up, and I'm just trying to get it all solid.

I appreciate the help!

[PhilipDAth]

As @alemabrahao says, enabled MSTP on all your Cisco Enterprise switches.
spanning-tree mode mst

Is there anything interesting in the logs on your 9300s?

[cmr]

Have you tried setting them to different values, not all set at 32768?  i.e. one at 12k, one at 16k etc.

[JustinGA]

I had read that as a possible solution... Would it be fine to change all the MS to that? 

[JustinGA]

I think i have been able to determine using packet capture that the TCNs are happening on the VPC between the 2 9372s.