Spanning tree questions
i was listening to the old Audio bootcamp by scot morris and there are 2 points i didn't get about spanning tree (section4):
1) at 16:00 he said that there is only one timer i can't change which is initial block time which must be 20 sec,
i don't get it what is that timer and when it happens???
2) at 36:05 he said about applying BPDU guard globally ,when SW recieve a bpdu it will revert to a normal port which i am not sure if it's correct because i know Regardless of how This feature is activated (Globally or interface) , a BPDUGuard-protected port that receives BPDU will be immediately err-disabled.
any confirmations to clear the confusion here?!!