From: Rick (rick@iptool.net)
Date: Mon Mar 01 2004 - 22:58:16 GMT-3
Although it isn't clear to me that you are asking a question or need help
with this. I do know some versions of IOS on the 3550's require the
multiples of 16. If you use 64 it will take it..
----- Original Message -----
From: "Ahmed Mustafa" <ahmed.mustafa@sbcglobal.net>
To: <ccielab@groupstudy.com>
Sent: Monday, March 01, 2004 4:15 PM
Subject: 3550 port priority settings
> I am trying to change port priority on 3550 switch, but getting the error
> message,
>
> Rack1SW1(config-if)#spanning-tree vlan 16 port-priority 50
> % Port Priority in increments of 16 is required
>
> Scenerio,
>
> S1 and S2 are connected via three physical trunk ports 1,2 and 3
> respectively.
>
> S1 is root bridge for Vlan 16 and without defaul settings Port 1 is in
> forwarding mode for vlan 16 and port 2 and 3 are in blocking mode.
>
> Port 1 wins the election because the Cost and Port priority are same for
all
> three ports, but based on lowest port id 128.1 for port 1, it wins the
> election.
>
> I tried to change the port priority of port 3 to 50 so it port id will
become
> 5.3, and then would like port 2 to have precedence over port 1 if port 3
goes
> down.
>
> The simple logic would be to change the
>
> port priority such as 100 for port 3, and it will become the root port,
then
> port prirority such as 110 for port 2, and will become the second best
root
> port,
>
> if the above two goes down then eventually port 1 will go in forwarding
mode.
>
> Regards,
>
> Ahmed
>
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