Hello.
In STP, after a topology change, a port takes by default 30 seconds (2 x forwarding-delay) to move from the blocking to the forwarding state
What was the design purpose of this? Why would a port need to listen to BPDUs for 30 seconds before moving to the forwarding state? This would mean that given the default BPDU hello-time of 2 seconds, a blocking port needs to receive 15 BPDUs from each of the other ports on the same segment before it can move to the forwarding state. This seems excessive.
So, what was the reasoning for having a port wait so long before moving to the forwarding state after a topology change.
Thanks,
Deepak