PIM SPARSE MODE

PIM Sparse Mode is utilized when there is less number of collectors. In PIM sparse mode there is an uncommon point called Rendezvous Point(RP).All sources and Receivers needs to enroll or Join this Point. At the point when source needs to send stream it needs to enlist the (S,G) to RP through Register message. The enlist message is send through unicast address towards RP. The Source IP address and Multicast Group(S,G) of server is embodied in the unicast enlist message. The RP in the wake of accepting the Register message,sends Register Stop message towards the Source.

 

At the point when Receiver needs to get the multicast stream,the client sends a report message to PIM router.PIM switch at that point sends a Join message towards RP.As long as recipient needs the Multicast stream,the PIM switches persistently hand-off the Join message towards RP.

Subsequent to enrolling the Source IP address and Multicast Group by Server and the join message by Leaf switch of Receiver,the source will forward the multicast stream towards RP.From RP the stream is sent towards the Receiver.The information sending from source to RP and RP to Receiver is called Shared Tree.When the Leaf switch gets the stream and checks the closest PIM neighbor to come to the Source.The Leaf switch sends prune message towards RP and Sends Join message by setting SPT hail bit towards closest PIM neighbor.Now the stream will sent in light of closest way of Source to receiver.This information sending is called Shortest Path Tree.One can cripple the Swithover to Shortest way tree from Shared tree by giving the summon 'ip pim spt-limit infinity'.By utilizing this order all Traffic is sent by means of RP and there is no change over to most brief way tree.