When an SDP is bound to a service, it is bound as either a spoke-SDP or a mesh SDP. The type of SDP indicates how flooded traffic is transmitted.
A spoke-SDP is treated like the equivalent of a traditional bridge ‟port” where flooded traffic received on the spoke-SDP is replicated on all other ‟ports” and not transmitted on the port it was received.
All mesh SDPs bound to a service are logically treated like a single bridge ‟port” for flooded traffic where flooded traffic received on any mesh SDP on the service is replicated to other ‟ports” (spoke-SDPs and SAPs) and not transmitted on any mesh SDPs.