By its definition, the multi-chassis ring operates in a revertive mode. This means that whenever the ring connectivity is restored, the BSA with lower IP address in the IB-RCC communication channel become primary for the path-a and the other way around for path-b.
After restoration of BFD session, the primary role, as described in Steady-state operation of dual homed ring, is assumed by respective BSAs. The FDB tables are updated according to the primary/standby role of the specified BSA and FDB population messages are sent accordingly.