Re: Root bridge

Hi Masroor,

Chris gave you two potential answers, why aren't they acceptable?

Just to recap what they are

1) Changing the bridge id of the switch you want to be root to have the
lowest MAC Address
2) Increasing the priority on the other switches from the default 32768 to a
higher value, so the unchanged switch will become root due to having the
lowest priority

Cheers,
Adam

On Thu, Sep 23, 2010 at 4:10 PM, masroor ali <masror.ali_at_gmail.com> wrote:

> see i have a question in a document asking to make a root bridge without
> changing priority, there must be a solution of this question..
>
> On Thu, Sep 23, 2010 at 12:59 AM, Chris Grammer <cgrammer_at_essilorusa.com
> >wrote:
>
> > Change the MAC to 0000.0000.0001 on the switch you want to be root?
> > Change the switch priority on all the other switches to be higher than
> the
> > switch that you want to be root.
> >
> > The bridge with the lowest Bridge ID wins.
> >
> > *Select a root bridge.* The *root bridge* of the spanning tree is the
> > bridge
> > with the smallest (lowest) bridge ID. Each bridge has a unique identifier
> > (ID) and a configurable priority number; the bridge ID contains both
> > numbers. To compare two bridge IDs, the priority is compared first. If
> two
> > bridges have equal priority, then the MAC addresses are compared. For
> > example, if switches A (MAC=0200.0000.1111) and B (MAC=0200.0000.2222)
> both
> > have a priority of 10, then switch A will be selected as the root bridge.
> >
> > http://en.wikipedia.org/wiki/Spanning_tree_protocol
> >
> >
> > <http://en.wikipedia.org/wiki/Spanning_tree_protocol>Chris
> >
> >
> > On Wed, Sep 22, 2010 at 11:45 AM, masroor ali <masror.ali_at_gmail.com>
> > wrote:
> >
> > > hi,
> > >
> > > is their any way to make a root switch without changing switch
> > priority???
> > >
> > > --
> > > Regards,
> > > Masroor Ali
> > > P Please don't print this e-mail unless you really need to.
> > >
> > >
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> >
> >
> >
> >
> >
>
>
> --
> Regards,
> Masroor Ali
> P Please don't print this e-mail unless you really need to.
>
>
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Received on Thu Sep 23 2010 - 16:18:57 ART