Re: Root bridge

Yes there are only few models on which we can change MAC, please check this
article from Cisco

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801c9b4e.shtml

So, only changing the priority on other switches would be option left

Experts, please correct if this is wrong

Thanks

On Thu, Sep 23, 2010 at 11:52 AM, masroor ali <masror.ali_at_gmail.com> wrote:

> I thought we cant change the MAC address of switch, I also tried to find
> out
> the command to change the MAC in 3550/3560 switches. can you please help me
> out???
>
> On Thu, Sep 23, 2010 at 11:18 AM, Adam Booth <adam.booth_at_gmail.com> wrote:
>
> > 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.
> >> > >
> >> > >
> >> > > Blogs and organic groups at http://www.ccie.net
> >> > >
> >> > >
> >> _______________________________________________________________________
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> _______________________________________________________________________
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> 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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>
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-- 
Hi
Rgds,
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