From: Ahamed Maideen (asadayan@xxxxxxxxx)
Date: Mon Jun 17 2002 - 14:35:56 GMT-3
Set span tree root [ vlan no] decreases the prioority by one from the
existing root. If the root priority is 32768 then it reduces the priority to
8192.
Assuming the case Switch A-------Siwtch B,
If Switch A is the root with priority 32768 for vlan 10, and if you apply
the command set spantree root [ vlan 10] on Switch B then the priority get
reduced to 8192
If Switch A is the root with some other priority say 8000 and if you apply
the same command on B now the Vlan 10 priority will get reduced by one
(7999)
Where as if you set the spantree priority to 0, you are forcing that switch
to be the root for that vlan and you are not allwoing any other switches to
be the root.
Now if you set the priority of Switch A to be 0 then if you apply the "set
spant root" command on Switch B , switch B will not accept the command
because it cannot furthur reduce it's priority lesser than the existing
roots priority (that is 0).
This functionality holds good only for 802.1d spanning tree.
Cheers,
Ahamed
----- Original Message -----
From: "ccie candidate" <ccie1@lycos.com>
To: <ccielab@groupstudy.com>; "Krucker, Louis" <louis.krucker@sunrise.net>
Sent: Monday, June 17, 2002 9:28 AM
Subject: Re: stp question
> hi
> what i know about this issue is that the two commands will do the same
function , the priority command is NOT recommended by Cisco ( i dont know
why but this is what is on the docs ) .
>
> the root command will decrease the priority from the default value
(32768 ) to 8192 which is enough to force your switch to be the root ( as
long as you keep the others switches to the default )
> this will be equivalent to setting the priority command to 8192 as well.
>
>
> i dont know what is the meaning of setting the priority to 0
> but may be this will not allow the switch to be a root at all.
> you check that and let me know :)))
>
>
>
>
>
>
>
> --
>
> On Sat, 15 Jun 2002 18:53:45
> Krucker, Louis wrote:
> >Hello group
> >
> >I'm still confused about those two commands
> >
> >set spantree root [vlan]
> >and
> >set spantree priority 0
> >
> >Which one set the switch to the root bridge, the cco docs
> >doesnt clear that issue. I think its the priority command because
> >the root command set the root priority to 8192 instead 0.
> >
> >It would be nice if somebody can clarify this issue.
> >TIA
> >Louis
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