Have a question regarding spanning tree and way its supposed to work when there is a redundant path in fiber daisy-chained switches. Root switch for all vlans is connected via fiber link to the first of the daisy-chained switches. Below is same config on each switch in regards to RSTP. See attached for switch topology.
We just installed redundant fiber between switch A and D. Correct me if I am wrong but if RSTP is working right on switch A and switch D, it should put trunk ports between the two to blocked since there is redundant path A<->B <->C<->D.
spanning-tree mode rapid-pvst
spanning-tree loopguard default
spanning-tree portfast edge default
spanning-tree extend system-id
switchport trunk allowed vlan X,Y,Z,...
switchport mode trunk