Re: STP Root port Eligibility

From: Bryan Bartik (bbartik@ipexpert.com)
Date: Thu Mar 26 2009 - 13:51:25 ART

Exactyl! Root guard is per port. Even with root guard enabled on one port,
other ports can be root ports. But if those ports happen to fail, then your
lowest cost port will still be "eligible" to be root.

On Thu, Mar 26, 2009 at 10:45 AM, Divin Mathew John <divinjohn@gmail.com>wrote:

> Wht if very other port shuts down! then the port would become root
> port.! wont it?
> Thanking You
>
> Yours Sincerely
>
> Divin Mathew John
> divinjohn@gmail.com
> divin@dide3d.com
> +91 9945430983
> +91 9846697191
> +974 5008916
> Sent from: Bangalore KA India.
>
>
> On Thu, Mar 26, 2009 at 10:11 PM, oluwaseyi ojo <sameoj@gmail.com> wrote:
> > Note the word "Eligibility", i.e. there other ports but this switchport
> the
> > task says should not be eligible.
> >
> > So I think lower the speed of that port gives it a higher cost path and
> in
> > STP it is the port with the lowest cost path that will be selected as
> root
> > port to the root bridge.
> >
> > My 2 cents
> >
> > On 3/26/09, Bryan Bartik <bbartik@ipexpert.com> wrote:
> >>
> >> Lowering the speed still allows the port to be root port if it is the
> only
> >> path. To prevent it "from ever being eligible to become a root port" you
> >> need to use root guard. Or shut it down :)
> >>
> >> On Thu, Mar 26, 2009 at 10:27 AM, oluwaseyi ojo <sameoj@gmail.com>
> wrote:
> >>
> >>> Give that port a lower speed `cause the lower the speed the higher the
> >>> cost
> >>> path. In STP, STP will choose a lowest cost path to the root bridge as
> the
> >>> root port.
> >>>
> >>> Cheers.
> >>>
> >>> On 3/26/09, ftt <femi0802@googlemail.com> wrote:
> >>> >
> >>> > Experts,
> >>> >
> >>> > How can you stop a switchport from ever being eligible to become a
> root
> >>> > port
> >>> > ?
> >>> >
> >>> > Regards
> >>> >
> >>> > FTT
> >>> >
> >>> >
> >>> > Blogs and organic groups at http://www.ccie.net
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> >>>
> >>
> >>
> >> --
> >> Bryan Bartik
> >> CCIE #23707, CCNP
> >> Sr. Support Engineer - IPexpert, Inc.
> >> URL: http://www.IPexpert.com
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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> >
> >
> >
> >
> 

-- 
Bryan Bartik
CCIE #23707, CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com

Blogs and organic groups at http://www.ccie.net

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