From: George Goglidze (goglidze@gmail.com)
Date: Wed Dec 12 2007 - 17:11:10 ART
Hi Nathan,
It does not actually react dynamically when the new router is added.
the "spanning-tree vlan 20,30,40 root primary " is just a script
which will check current root switch's priority, and set 4096 less.
as well it calculates hello-interval and forward-interval if I'm not
mistaken, if you specify your network's size.
but once the script is run, and later if you add another switch with better
priority,
it does not mean you will have your router re-calculate the priority again.
And as to the initial question, I'd just put 4096 as priority and that's
it.
also maybe I would ask proctor if new switches are going to have default
configuration of spanning tree or not.
Regards,
On Dec 12, 2007 8:22 PM, Cielieska Nathan <ncielieska@gmail.com> wrote:
> Felix
>
> Do a spanning-tree vlan 20,30,40 root primary.
>
> The reason i would do that is because there are other calculations
> besides priority that can come into play. Setting the root command
> will allow the switch to react dynamically to spanning-tree elections
> by tuning things in its favor to become root.
>
> Regards,
> Nate
>
> On Dec 12, 2007, at 12:07 PM, Felix Nkansah wrote:
>
> > Hi,
> >
> > I am considering a spanning-tree task (dont have the answers tho).
> >
> > *It requires that, of the four switches in the network, SW1 be set
> > as the
> > root for VLANs 20, 30, 40.*
> > **
> > *SW1 should be set such that it would remain the root if even other
> > switches
> > are added to the network in future.*
> >
> > Would setting a command like *'spanning-tree vlan 20,30,40 priority
> > 0'* be a
> > good solution?
> >
> > I'm afraid the *'spanning-tree vlan 20,30,40 root primary'* command
> > may not
> > be able to cater for the 'future switches' caveat.
> >
> > Let me have your expert opinions, please.
> >
> > Regards,
> >
> > Felix
> >
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