04-01-2009 03:12 AM - edited 03-06-2019 04:56 AM
Hi all
I read that the forward delay time for listening and learning is 15 secs, is this 15 seconds each, so 30 in total, which seems more real ?
04-01-2009 05:26 AM
Hello Carl,
it is 15 seconds timer used two times.
by the way for the other thread:
this 15 seconds accomodates for
7 switch hops with an hello interval of two seconds:
15 = 7*2 + 1
So in legacy 802.1D if the diameter is increased over 7 hops the timer has to be changed accordingly.
the forward timer must be greater then the time it takes a message to travel on the whole tree
Hope to help
Giuseppe
04-01-2009 07:14 AM
so are we talking about the listening and learning timers? if so, when you change the forward delay to 20 secs, would this be 20 for each ?
also when the bpdu is sent from the root, the other switches forward this on, so it will get forwarded every 2 secs passed on from the switch before?
also am i right in saying it is different in RSTP, as every switch generates its own BPDU ?
cheers
Carl
04-01-2009 07:54 AM
Hello Carl,
your understanding is correct or at least I agree with you
Hope to help
Giuseppe
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