From: Scott Morris (swm@emanon.com)
Date: Wed Jul 09 2008 - 14:31:22 ART
It's not possible to be both. Think about it...
A root port is your SWITCH's decision that this is the best path back to the
root bridge.
A designated port is the LINK's "decision" that this is the best path back
to the root bridge.
Assume we're talking a link from Cat1-Cat2. So if the link elects Cat2 as
the designated port, that means that everything from downstream (Cat1)
should see that as the best path. If Cat2 tries to say that same port is
the root port, that means everything FROM Cat2 goes out the port (in
collision with the first statement).
So logically we'd have some difficulty there. Designated port is a "come to
me" idea. Root port is an "I'll go this way" idea.
HTH,
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Sent: Wednesday, July 09, 2008 12:23 PM
To: ccielab@groupstudy.com
Subject: Can you make a root port a designated port?
I have a switch with 3 connections to another switch that is the root. One
of the connections is a dot1q trunk. I'm tasked with making it a designated
port. I have tried a number of configurations and I've come to realize that
I cant make it designated because that would mean that one of the other
ports has to become root. If I could then make make the port designated I
have a loop.
Ports going to the root can only have two states root forwarding or altn
blocking right?
Can anyone see a way to accomplish this? besides making my switch the root?
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