P.A, I had a similar issue with Foundry switches and cisco. Try setting the spanning-tree priority. For us, this stop the spanning-tree topology changes.
> The cisco 6509 is running rapid-pvst and the HP switches are running rstp. > The cisco was the root bridge and all HP's saw the cisco as the bridge > however I ran into issues where everything would work as expected for > several minutes, 7 -10 min, and then parts of the network would become > inaccessible all of the sudden without it ever bring up a redundant path. I > also saw numerous STP topology changes etc on the HP switches while this was > going on. -- Christina
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