CHAPTER 7. MultiCast Protocols
122
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Terminology
Following is a brief description of terms and concepts used to describe the
PIM-SM protocol:
Rendezvous Point (RP)
A Rendezvous Point(RP) router is configured as the root of the non-
source¬specific distribution tree for a multicast group. Join messages from
receivers for a group are sent towards the RP. Data from senders is sent to the
RP so that receivers can discover who the senders are, and receive traffic
destined for the group.
Multicast Routing Information Base (MRIB)
The MRIB is a multicast topology table derived from the unicast routing table.
In PIM-SM, the MRIB is used to decide where to send Join/Prune messages.
It also provides routing metrics for destination addresses. These metrics are
used when sending and processing Assert messages.
PIM SM SPT Switchover Phase 3
Ethernet
et.1.1
R3 RP
R4 Sends(S, G) join to R1
Receiver
et.1.2
et.1.1
et.1.2
et.1.1
et.1.3
et.1.1
R2 R1
R5 R4
et.1.3
et.1.1
et.1.3
et.1.3
Receiver
Ethernet Ethernet
solid Nines Shared Tree Packet Flow Dotted Lines
APT Packet Flow Dotted Blue S,G RP Bit Prunes
DottedRed Lines S, G Prunes
et.1.2 et.1.2
R4
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