From: Joseph Ezerski (jezerski@xxxxxxxxxxxx)
Date: Fri Mar 01 2002 - 16:47:09 GMT-3
Alain, I am assuming that you only have one vlan? The command you entered
here will set the spantree priority first to 0, then back to 65535 but only
for VLAN 1.
Try this instead:
set spantree priority 0 <vlan #>
Do that for every vlan you have but only on the root bridge. Leave every
other switch the default. Note that you stand a good chance of seeing a
major recovergence if you are entering that command on the switch that is
not currently the root.
That will work. I am 100% sure.
Forget about root guard for now. Spantree Priority 0 protects you from
about 99.999% of anything else becoming the root.
-Joe
-----Original Message-----
From: alain faure [mailto:alainfaure@yahoo.fr]
Sent: Friday, March 01, 2002 11:30 AM
To: jezerski@broadcom.com; 'Leigh Anne Chisholm'; 'Clark J';
ccielab@groupstudy.com
Subject: RE: a question on SPANTREE
hi,
to solve the problem with another way i try :
- set spantree priority 0
- set spantree priority 65535
- set spantree guard root 4/28 (one port of my catalyst)
Without success, any comments ?
Best regards
--- Joseph Ezerski <jezerski@broadcom.com> a icrit : > If you want to get
really advanced and you have bigger switches, like the
> Cat6509, look into the root guard feature.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Leigh Anne Chisholm
> Sent: Friday, March 01, 2002 10:34 AM
> To: alain faure; Clark J; ccielab@groupstudy.com; clark.j@163.com
> Subject: RE: a question on SPANTREE
>
>
> That's a drastic response to what is actually a simple problem. In
> implementing that solution, you're creating the potential for problems
well
> beyond those that you want to resolve. Spanning Tree has a simple
priority
> system that's easy to manipulate that doesn't have the implications of
your
> solution.
>
> Check the CCNA curriculum for information on how to configure a switch so
> that
> it can't become the root switch in any given VLAN.
>
>
> -- Leigh Anne
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> alain faure
> Sent: Friday, March 01, 2002 11:23 AM
> To: Clark J; ccielab@groupstudy.com
> Subject: Re: a question on SPANTREE
>
>
> hi,
>
> that's interresting question, and we have a long debate on this with some
of
> my
> friends about one of our customer site.
>
> for me, i think the better way (but they don't agree with me) is to
disable
> spanning tree on the VLAN for the switch you don't want they become root ?
> What
> do you think about ?
>
> best regards
>
>
> --- Clark J <clark.j@163.com> a icrit : > Dear CCIEs and Near CCIEs,
> > How to configure a switch so that it can't become the root switch in
> VLAN
> A
> > ?
> > Best regards,
> > Clarke J
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