From: John (jgarrison1@austin.rr.com)
Date: Wed Jul 09 2008 - 23:22:05 ART
The task says make f0/14 a designated port no mention of any particular
vlan, which to me implies PVST, which is the default. It's not explicit,
but that's what I got. The answer in the study guide is to set the port
cost to one, which does nothing besides making f0/14 the root port.
----- Original Message -----
From: "Huan Pham" <Huan.Pham@peopletelecom.com.au>
To: "Scott Morris" <swm@emanon.com>; "John" <jgarrison1@austin.rr.com>;
<ccielab@groupstudy.com>
Sent: Wednesday, July 09, 2008 5:18 PM
Subject: RE: Can you make a root port a designated port?
> Hi,
>
> We can make a switch the root for some set of VLANs, and non-root for
> another set of VLANs.
> Similarly, we can make a switch port a root port for one set of VLANs,
> and a designated port for another set of VLANs.
>
> Depending on the exact wording of the question, making a port both a
> root port and a designated port can be complished.
>
> Cheers,
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Scott Morris
> Sent: Thursday, 10 July 2008 3:31 AM
> To: 'John'; ccielab@groupstudy.com
> Subject: RE: Can you make a root port a designated port?
>
> 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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> Study hard and be Eeeeviiiil......
>
>
> -----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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