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Improved PIM-SM register procedure (1/2) Basic idea:DR will not forward/encapsulate MC until the delivery path has been established. Once the MC path from DR to RP has been established, the MC packets from the sender will be forwarded. Separate control plane and data plane completely Registering Process in the control-plane Sender management (logical messages. Two choices: (i) IGMP/MLD can be extended for this purpose; (ii) define new protocol)) Sender-Request: request for sending MC data. DR-ACK: positive indication for allowing the sender to send MC data. DR-NAK: negative indication for not allowing the sender to send MC data. Sender-Alive: periodically sent by the sender to notify the DR that the sender is alive. Sender-Leave: the sender notifies the DR that it will not send MC data any more. DR’s register process (define 3 new messages except Join) Register-Request: DR sends this message to RP to register. Join: to join the MC delivery tree SPT-OK: to notify the downstream routers on the SPT that the sender is alive, update the corresponding status in routers. Periodically sent from the root of SPT, either responded as a newly branch grafting this SPT. MC-Over: the sender will not send MC data, the SPT will be deleted (the corresponding status will be removed MC data packets delivery in the data-plane |