In the algorithm specified in the IEEE standard, MSTP does not consider the VLAN membership of ports when calculating
the active topology.
As MSTP is designed to control all ports on a bridge, not just a subset of ports, for each MSTI, it does not work well with
the manual VLAN configuration model.
In the "Understanding MSTP 802.1s" Cisco document, it is not very clear if the Cisco MSTP implementation limits the active
topology of an MSTI only to the ports that have VLANs belonging to that MSTI.
Is it true? If it is true, is this solution IEEE compliant?