From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Thu Dec 15 2005 - 14:38:34 GMT-3
Hey Bro. You are right about that, but you can not set the fwd-time to 0,
the minimum option is 4.. My question was more related to that fact and what
value is set in the fwd-time when using PortFast.. My guess is that the
value is 0.
Sorry I do not have a couple of switches to test this configuration :-(
Thanks
Victor.
_____
De: CCIEin2006 [mailto:ciscocciein2006@gmail.com]
Enviado el: jueves, 15 de diciembre de 2005 13:13
Para: Victor Cappuccio
CC: ccielab@groupstudy.com
Asunto: Re: Spanning Tree PortFast and Forwarding Time.
The way I understand it is spanning tree has two timers, maxage and forward
delay.
Maxage is 20 seconds, forward delay is 15.
So it goes like this:
Blocking -> Listening: 20 seconds (Maxage)
Listening -> Learning: 15 seconds (Forward Delay)
Learning -> Forwarding: 15 seconds (Forward Delay)
Total: 50 seconds
Actually in the real world I have timed it to be closer to 30 seconds for
the entire process.
When you enable portfast it bypasses all of the above.
If you set the forward-time to 0 seconds I think you would still have to
wait for maxage to expire which is 20 seconds. Try it in the lab and tell us
how it works...
On 12/15/05, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
Hello Friends..
I'm courios about this, in
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225sec/3550scg/s
wstpopt.htm#wp1031116 say us that
Port Fast immediately brings an interface configured as an access or trunk
port from a blocking state to the forwarding state, bypassing the listening
and learning states.
In my interpretation (IMI), and because the output of the
spanning-tree vlan 2 forward-time ?
<4-30> number of seconds for the forward delay timer
result that the algortim (IMI) set the forwarding delay to 0, is that
Correct? Or it simply see that there is some king of turn on flag and the
continues to the next operation = That is Listening - Learning - Forwarding
I'm correct, or there is something more in the middle?
Thanks
Victor.
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