From: Phil (ccie9323@yahoo.com)
Date: Fri May 28 2004 - 09:45:01 GMT-3
I agree, there is only one root bridge, but the STP
path is built by first, checking the bridge
priorities, then the port priorities and last, the
port cost.
You can manipulate the bridge priorities in you domain
as you please to build the STP path you want.
By default all bridge priorities are 32768, issuing
the command spanning-tree root primary lowers the
priority to 8192 and spanning-tree root secondary
lowers the priority to 16384. Because the other two
switches still have a priority of 32768 the link
between them will be blocked.
Phil
--- Carlos G Mendioroz <tron@huapi.ba.ar> wrote:
> I don't think so.
> There's only one root bridge in a converged STP
> domain.
> Changing a non-root bridge priority will have no
> impact in the STP
> topology...
>
>
> Phil wrote:
>
> > Tom,
> >
> > You have to make cat2950#1 the secondary root to
> > acomplish this. First, STP checks the bridge
> priority
> > and then the port cost as a tie breaker.
> >
> > Phil
> >
> > --- Tom Young <gitsyoung@yahoo.co.jp> wrote:
> >
> >>Hi, group
> >>
> >> I confused on the spantree question. I
> connected
> >>the
> >>network as below, two cat6509s and two cat2950s,
> the
> >>cat6509#1 for the STP root and the cat6509#2 for
> the
> >>secondary root. The port that connect cat2950#1
> from
> >>cat2950#2 was blocked by STP function. I want to
> >>block the
> >>port that from Cat6509#2 to Cat2950#2. I tried the
> >>next
> >>two commands, but failured, how can I do ? Help
> >>me,please.
> >>
> >>set spantree portvlancost 3/3 cost 200
> >>set spantree portcost 3/3 cost 200
> >>(the port 3/3 of cat6509#2 was connected with
> >>cat2950#2)
> >>
> >> cat6509#1------cat6509#2
> >> | |
> >> | |
> >> cat2950#1------cat2950#2
> >>
> >>__________________________________________________
> >>Do You Yahoo!?
> >>http://bb.yahoo.co.jp/
> >>
> >>
> >
> >
>
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