We have a site that is running MSTP that we need to add a new Vlan to that will be contained on the core switch. The Vlan in question is currently mapped to the default 0 instance but is not configured yet i.e. (config)#vlan 600
My question is what is the consequence on the MSTP region if I only add this Vlan to the core switch but don't map it to any of the currently configured instances (1 &2). I've read that it should not impact the region as I'm not adjusting the MSTP configuration, but wondered if this was correct based on people's experiences with the protocol. My experience with it is very limited.