Regarding MSTP, is it possible to have different VLAN mapping for different regions ?
Example: Region 1: Instance 1: VLAN 10,20,30 Instance 2: VLAN 40,50,60
Region 2: Instance 1: VLAN 10,50,60 Instance 2: VLAN 20,30,40
Also I read in Cisco press CCNP references: "VLANs are grouped into an instance, and each instance elects a root bridge."
So you confirm that inside a region, we have one root bridge per instance ? So inside a region we could have different root bridge for different instances ?
So in conclusion inside a region composed of three bridge for example, A, B and C, A could be the root bridge for the IST (instance 0), B could be the root bridge for the instance 1 and C the root bridge for the instance 2 ?