From: Tom Young (gitsyoung@yahoo.co.jp)
Date: Thu Jun 03 2004 - 10:34:30 GMT-3
Garlos
The root I means is switch keep the highest priority
for spanning-tree network , for example, 4096, The
secondary root means the switch with priority 8192, the
others switch means the switch keep default priority as
32768.
--- Carlos G Mendioroz <tron@huapi.ba.ar> $B$+$i$N%a%C%;!<(B
$B%8!'(B
> 1: port cost is added at link destination, not at
> link source.
> 2: all ports of root bridge are forwarding by
> definition
> (except perhaps a looped pair which is a non
> standard case)
> because the root switch is the designated switch for
> all attached
> segments, because it has 0 cost to the root.
> There is no "secondary root" in the game, as long as
> the primary is up.
> Root determination comes first, then root path
> determination (so the
> secondary root may even be at the edge of the
> spanning tree, with no
> ports in forwarding state).
>
> Tom Young wrote:
>
> > Hi, group
> >
> > I have two question about STP.
> >
> > 1, I set the port cost as 2000 on one switch's
> interface ,
> > but it seems the cost couldn't be transfered to
> the
> > downstream switch, the downstream switch still use
> the
> > actual cost to calculate the STP. And show the
> > spanning-tree on the downstream switch , I won't
> see the
> > cost 2000 be added.
> >
> > 2, All the ports of root and secondary root are
> always
> > keep forwarding status in STP calculation , even
> change
> > the port cost to a bigger value, why ?
> >
> > Thanks alot
> >
> > __________________________________________________
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> >
> >
>
This archive was generated by hypermail 2.1.4 : Sat Jul 03 2004 - 19:40:32 GMT-3