No .. MST is per instance .
So all the vlans linked to particular instance will follow same path . So
MSTP for these set of vlans linked to same instance will be same .

Hence no recalculation .

Thnx
Gaurav Madan
CCIE # 23863

On Tue, Jun 21, 2011 at 6:21 PM, Rob Rademakers <[email protected]> wrote:

> Hi Guys,
>
> I'm planning a pvst to MST migration in our datacenter network and I need
> some advice about some specific MST behaviour.
>
> In the configuration guide is mentioned:
> the complete MST database gets reinitialized for any incremental change,
> such as the addition of new VLANs to instances.
>
> We create VLANs weekly during office hours so we can't use those MST
> recalculations in our network. My idea is as follows:
>
> If we assign all vlans, including not-yet-existing vlans to a MST instance
> during our pvst - MST migration. Will there be a MST recalculation in the
> instance when we create a new vlan, when that vlan is already active in a
> MST instance?
>
> Thanks!
> Rob
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