Rendezvous Point in PIM-SM advantage

[madmin.kz]

Hello!

Please explain to the multicast issue:

What is the advantage of using the Rendezvous Point in PIM-SM

Why  we can not build a Shortest Path Tree from the multicast source?

[Raju Sekharan · Accepted solution]

Hi

A mulitcast source router will  send the multicast traffic only to the receivers who are requesting it

For a receiver to request the traffic from the source, it needs to know the source of the multicast traffic

RP helps for this in PIM SSM. Sources register with RP. The interested receivers send the (*,G) join towars the RP

Then the initial traffic flows from source to RP and via RP-Tree to the receiver.

If the receiver router is configured for SPT switch-over, it will send a (S,G) join towards the source and traffic can start flowing via shortest path

Thanks

Raju

[madmin.kz]

Thaks a lot!

It's really very simple

[Raju Sekharan]

you are welcome

There was a type error in my reply. 

"RP helps for this in PIM SM" is the right sentence.

Thanks

Raju