RSTP issue

[vivekprajapati93]

I had configured 2 P2P with RSTP protocol between two location primary one Fiber and secondary on RF which is backup P2P , it's successfully worked. But some time without any fiber outage or down traffic divert on RF P2P. Primary is 200mbps and Secondary is 100mbps. But I don't know why traffic flow change primary to secondary. So application which are run on this network getting slow at side B location. 

[Giuseppe Larosa]

Hello @vivekprajapati93 ,

the primary path is used until STP BPDUs are received on the secondary site originated by the primary site where the root bridge is located for all STP instances.

So check on the secondary site using

show spanning-tree   vlan x detail

check for Topology changes

check for the state of the ports to the primary circuit and to the secondary link

Hope to help

Giuseppe