The spoke SDP link-type command instructs STP on the maximum number of bridges behind this spoke SDP. If there is only a single bridge, transitioning to forwarding state is based on handshaking (fast transitions). If more than two bridges are connected by a shared media, their spoke SDPs should all be configured as shared, and timer-based transitions are used.
Valid values for spoke SDP link-type are shared and pt-pt, with pt-pt being the default.
CLI syntax:
config>service>vpls>spoke-sdp>stp#
link-type {pt-pt|shared}