We have a data center appliance that runs RSTP, and connects via a Cisco switch with upstream clients on an upstream VLAN and also connectes with downstream devices through a different downstream VLAN, through the Cisco switch. Our appliance uses two interfaces on the Cisco switch that runs MST so both the upstream and downstream Interfaces/VLANs become part of the MST instance. Our appliance needs both connected interfaces to be left in forwarding state but we find that MST blocks one of the two interfaces. Rightfully so as defined in the protocol!
Looking for suggestions on overcoming this issue because our deployments need both interfaces to be active.
Is there a way to exclude the two interfaces connected to our appliance from the MST region? It is much preferred that the external clients and the upstream interface on our appliance need to be on the same VLAN.