Diagram of our network attached.
We have 2 core switches and 2 access switches connected in a resilient design. Access Switch 1 is configured with Data VLAN 101 and Voice VLAN 102 and Access Switch 2 is configured with Data VLAN 201 and Voice VLAN 202.
We are looking to configure MSTP to load balance the Data and Voice VLANs over the Access Switch uplinks so no links are blocking. With this scenario, would it be ok to configure 2 MSTP intances and map the Data VLANs 101 and 201 to instance 1 and Voice VLANs 102 and 202 to instance 2 with Core 1 as Root for instance 1 and Core 2 Root for instance 2? Or would I need to configure 4 MSTP instances one for each possible topology?
I will also have VLANs that will only need to transit Core 1 and Core 2, should these VLANs map to a dedicated Instance or is the IST ok for this?