Each entry in this table identifies the ring to which TC needs to be propagated upon FDB flush condition in the sub-ring. When TC propagation is enabled for a sub-ring (the object 'fsErpsRingConfigPropagateTC' is configured as 'true' for the sub-ring), and whenever FDB flush is triggered on this sub-ring, Topology Change will be triggered for all the associated rings of this subring as identified by this table.