
Customizing Protocol Independent Multicast
117355-D Rev 00
6-13
3.
If the RP has no downstream members that want to receive multicast traffic
for the group, the RP sends a register-stop message to the DR for the source.
The DR starts the register suppression timer upon receiving the first
register-stop message. During the register suppression timeout period (the
default is 60 seconds), the following events occur:
• The source’s DR sends a probe packet to the RP before the register
suppression timer expires (default is 5 seconds). The probe packet
prompts the RP to determine whether any new downstream receivers have
joined the group.
• If no new receivers have joined, the RP sends another register-stop
message to the source’s DR, and its register suppression timer starts
again.
• When the RP no longer responds to the source DR probe message, the
register suppression timer expires and the DR sends encapsulated
multicast packets to the RP. The RP uses this method to tell the DR that it
has new members that have joined the group.
4.
The DR continues to send encapsulated multicast packets to the RP until it
receives a register-stop message or a prune message.
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