From: Bob Sinclair (bsin@erols.com)
Date: Fri Nov 01 2002 - 17:05:08 GMT-3
The bottom-line benefit of portfast it that the port comes up within a second or two of link. Kennedy Clark in Cisco LAN Switching calls it a "forward-delay" optimization. In other words, forward delay in zero or near zero. SO, technically you could say the port goes through blocking>listening>learning>forwarding, it just spends next to no time in listening and learning. Many Cisco DOCs say it "skips" listening and learning.
----- Original Message -----
From: "Steve" <yyao@sympatico.ca>
To: <ccielab@groupstudy.com>
Sent: Wednesday, October 02, 2002 1:37 PM
Subject: portfast
> All,
>
> The following is copied from Cisco website:
>
> "An interface with Port Fast enabled goes through the normal cycle of STP
> status changes when the switch is restarted."
>
> If the above is true, what is the benefit of portfast? I originally think
> one of the advantage of portfast is for the switch to bypass the normal
> cycle of STP and put the port into forwarding state, however, what I read
> from the Cisco website says the contrary.
>
> Can anyone please let me know?
>
> Thanks
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