On Tue, Jul 14, 2009 at 2:22 PM, Geoffrey Pendery <[email protected]> wrote:

> > Will adding new VLANs to an MST instance disrupt traffic flow for other
> > VLANs in that MST instance?
>
> Yes.  We've verified this.
> A trunk port carrying only VLAN 30, or even an access port carrying
> only VLAN 30.
> VLAN 30 is in instance 2.  You go into config mode and add VLAN 50 to
> instance 2 (or remove it from instance 2)
> The port, be it access or trunk, goes to blocking, learning, forwarding.
>

...and if that doesn't make you nervous, you probably shouldn't be running
spanning-tree...

Tim:>
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