The virtual port number uniquely identifies a spoke SDP within configuration BPDUs. The internal representation of a spoke SDP is unique to a system and has a reference space much bigger than the 12 bits definable in a configuration BPDU. STP takes the internal representation value of a spoke SDP and identifies it with its own virtual port number that is unique to every other spoke-SDP defined on the VPLS. The virtual port number is assigned at the time that the spoke SDP is added to the VPLS.
Because the order in which spoke SDPs are added to the VPLS is not preserved between reboots of the system, the virtual port number may change between restarts of the STP instance. To achieve consistency after a reboot, the virtual port number can be specified explicitly.
CLI syntax:
config>service>vpls>spoke-sdp# stp
port-num number