From: S Malik (ccie.09@gmail.com)
Date: Mon Sep 22 2008 - 11:01:03 ART
We can use spant-ree guard root to make downstream switch not to become
root. If a switch will never become root for a vlan then we can disable
spantree for a vlan OR we can use switchport trunk forward vlan Option
(difference b/w forward vlan and prunning?).
If we need to make a switch less favourable then set priority to 65535, in
this case any other switch with the same priority and smaller Mac address
may become root.
On 9/21/08, Bill Eyer <beyer@optonline.net> wrote:
>
> All,
>
> Without seeing the exact question, it's hard to say for certain. However,
> disallowing a vlan on a trunk or using root guard can prevent a switch from
> taking over a root, but it can become a root itself for that vlan. Therefore
> it depends on how you read the question. My thought was based on a scenario
> I did once where disabling spanning for that vlan was just fine, it was only
> used on one switch.
>
> Bill
>
> Narbik Kocharians wrote:
>
>> Reachability can be an issue. I don't know the exact question but you guys
>> are all on the right track.
>>
>> On Sun, Sep 21, 2008 at 12:49 PM, Adam Elghafri <ccie.adam@gmail.com<mailto:
>> ccie.adam@gmail.com>> wrote:
>>
>> what about
>>
>> #sw trunk allow vlan except 33
>>
>> in all trunks pointing to that switch...
>>
>> narbik.. ur comment on this
>> On Mon, Sep 22, 2008 at 1:00 AM, Bill Eyer <beyer@optonline.net
>> <mailto:beyer@optonline.net>> wrote:
>>
>> > The only way to make certain a switch NEVER becomes a root is to
>> disable
>> > spanning tree for that vlan. This is OK to do if there is no
>> physical
>> > loops.
>> >
>> > Bill
>> >
>> >
>> > Igor M. wrote:
>> >
>> >> Hi All,
>> >>
>> >>
>> >> How do you make sure that a switch would never become a root for a
>> >> particular
>> >> vlan with a condition that you are not allowed to use any
>> commands that
>> >> modify the bridge priority?
>> >>
>> >>
>> >> Thanks!
>> >>
>> >> ----------------------
>> >>
>> >> I.M., M.Eng. P.Eng.
>> >>
>> >> Network Architect
>> >>
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>> --
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>>
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>> --
>> Narbik Kocharians
>> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
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