how to find where the topology changes are happening?

[Yusuf_Kabbara]

I have about 130 switches in 8 rings topology, all connected to one core switch.
looking to the "Number of Topology Changes" I am finding high numbers, but I cannot figure out where this changes is being happened.

the used switches: X440, BD8806
Network cabling: 10G FO.

any way to figure out?

[Jeremy_Gibbs]

When you go to the core, type in

show stpd "s0" ports counters.

What output do you see?

[Yusuf_Kabbara]

No such an argument!