Re: Root bridge

Enable uplink fast which changes switch priority to a higher value.

it might be helpfull

On Thu, Sep 23, 2010 at 9:39 AM, Pramod G <learn02earn_at_gmail.com> wrote:

> 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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> > >> >
> > _______________________________________________________________________
> > >> > Subscription information may be found at:
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> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >>
> > >>
> > >> --
> > >> 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
> > >>
> > >>
> _______________________________________________________________________
> > >> Subscription information may be found at:
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> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> >
> >
> > --
> > 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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> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Hi
>
>
> Rgds,
>
> It does not mean a thing, if it can't make a ping!! :-)
>
>
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>
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Received on Thu Sep 23 2010 - 11:08:31 ART