If the service instance is a B-VPLS, and an associated B-MAC address is configured for the failed SAP and SDP-binding, the SMGR performs a lookup using the B-MAC address to find out which pipe services are notified and then propagate fault to these services.
Within the same B-VPLS service, all SAPs/SDP-bindings configured with the same fault propagation B-MACs must be faulty or oper down for the fault to be propagated to the appropriate pipe services.