spann tree topology changes

[Amafsha1]

Hello all, 

If In my datacenter i had all 3850s and 9300 cats, with the latest iOS, what would be a good command(s) that I would use to see if there are frequent TCN changes on STP.  I believe I have switches that are not using the same version of spanning-tree and I would like to potentially investigate if this is causing a problem on the network.  

I'm just curious what STP commands people use to troubleshoot bad STP design and seeing if there are a lot of toplogy changes.  Sorry for the kind of vague question, just learning about STP.

Thank you

[balaji.bandi]

here is the spanning tree troubleshoting guide :

https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/28943-170.html

and understanding :

https://community.cisco.com/t5/networking-documents/spanning-tree-loop-troubleshooting-and-safeguards/ta-p/3115040

As long as you have setup correct priorities and configuration, you should be ok.....you need to make toployg and see where L2 links are looping and concentrate in that links.