The HA Support for MLDP feature enables MLDP to checkpoint label forwarding or path set information. To support NSF, MLDP
uses existing PIM HA architecture to checkpoint the information to the standby RP.
MDT data group creation is a dynamic event triggered by traffic exceeding a specified threshold. When the threshold is exceeded
(requiring an MDT data group to be created) or when traffic falls below the threshold (requiring the MDT data group to be
deleted), the router detecting the event creates, deletes, or updates an MDT data "send" entry, creates the corresponding
(S,G) state, if necessary, and sends a message to PE peers to create, delete, or update a corresponding MDT data "receive"
entry and the corresponding (S,G) state.
The active RP will checkpoint the current state of the MLDP peer, paths to peers, root, paths to root, and the database and
replication/branch entry onto the standby RP and use this state to recreate the MLDP state after a switchover.