[j-nsp] Help with MSTP in EX8208

[Chuck Anderson]

On Wed, Apr 02, 2014 at 01:29:46PM -0400, Chuck Anderson wrote:
> On Wed, Apr 02, 2014 at 03:36:51PM +0200, Octavio Alfageme wrote:
> > I would like to have ae2.0 blocked in instance 1 and ge-20/0/1.0 blocked in
> > instance 2. That's why I modify the cost of ae2.0 interface within instance
> > 1 in both switches:
> >
> > Could you, please, help me to discover what I'm doing wrong?
> 
> Change the msti bridge priority, but make sure you use 4k boundaries.
> 
> I use 0 for the root bridge, and 4k for the other:
> 
> msti 1 {
>     bridge-priority 0;
>     vlan ....
> }
> msti 2 {
>     bridge-priority 4k;
>     vlan ....
> }
> 
> That way if another device is attached without proper configuration,
> the default value of 32k will never override my configured root
> bridges.
> 
> For switches that I configure to be attached to the core switches, I
> use bridge priorities of 16k, 20k and 24k, going higher for each
> additional hop away from the core switches, but still lower than the
> default 32k.

Oh, and I forgot the detail;

One EX8200 should have the opposite bridge-priorities from the first!

EX8200-A:

bridge-priority 0;
msti 1 {
    bridge-priority 0;
    vlan ....
}
msti 2 {
    bridge-priority 4k;
    vlan ....
}

EX8200-B:

bridge-priority 4k;
msti 1 {
    bridge-priority 4k;
    vlan ....
}
msti 2 {
    bridge-priority 0;
    vlan ....
}