- Bronze, 100 points or more
Please consider the following scenario ( My apology for messy diagram):
The network is convergred and a switch located inside (not shown) switched network is elected as root bridge.
1) Let say for for some reasons Sw1 stops receiving bpdu on its f1/1 port. Let say 30 seconds have passed, How will sw1 react? Will sw1 transition its f1/3 blocked port to forwarding state or will it put f1/3 through learning and listening states first?
2) Please consider the above diagram. Network has converged with root switche inside the switched network. Let say someone connects a new switch with a lower priority.
As a result sw1 receives a superior bpdu on its f1/1. Sw3 also receives a superior BPDU on its f1/2 port.
Sw3 forwards the bpdu out of f1/3; sw1 also forwardsthe bpdu out of its port f1/3. Sw1 concludes the bpdu it has transmitted out of f1/3 is superior and decides f1/3 as designated port. The question is while all this happening,will sw1 continue to forward user frames?
thanks and have a great weekend
I think that SW1 blocked port would move trough listenning state and exchange BPDU with SW3 to decide which port will be the new designated port as a new root bridge has been heard. The election will be :
- lowest root bridge ID (the same in this case)
- lowest root path cost.
- lowest sender bridge ID.
- lowest sender port ID.