Thanks for your reply and suggestions.Actually we have SF300 switches also in network along with catalyst switches and SF300 does not have PVST or rapid PVST option. Hence we are suffering a lot to tuning the Spanning-tree in network. Is there any no...

Does RSTP and Rapid PVST performed well ? Means.. Suppose In my network I have three cisco switches, two are running on RSTP and middle one is running on Rapid PVST.  In my case... with above scenario spanning tree is not working well, one of the RST...