From: NET HE (he_net@hotmail.com)
Date: Sat Feb 07 2009 - 15:22:50 ARST
Case 1
If only talking about port interface startup delay time, only forward-delay
time comes into play. When you unshut the port, switch analyses if it needs to
keep it blocked to make sure loop free. If not, the port enters to listening
status for a period of forward-delay time, then enters to learning status for
another period of forward-delay time, finally enters to forwarding status. So
totally for this scenario, 2 x forward-delay is needed.
Case 2
The scenario of max-age timer comes into play is when the port is already in
blocking status. The port is expecting to receive BPDU every BPDU hello
interval. When the port receives a expected BPDU, it resets the max-age timer.
Suppose the expected BPDU is not received by any means, the max-age timer
keeps increment untill it expires. Then from this moment, switch goes through
the process of the first case. Then the total time is max-age + 2 x
forward-delay.
Hope it helps.Best Regards, Net (Xin) He > Date: Sat, 7 Feb 2009 14:39:59
+0100> Subject: link max age and forward-delay> From: abdulmuri@gmail.com> To:
ccielab@groupstudy.com> > Hi GS,> > how does the value of Max age and the
forward-delay time affect the> total interface startup delay time> > -- >
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