Dell M6220 User Configuration Manual page 1185

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This (*, G) Join travels hop-by-hop to the RP, building a branch of the

Shared Tree that extends from the RP to the last-hop router directly

connected to the receiver.

At this point, group "G" traffic can flow down the Shared Tree to the

Phase-2: Register Stop

Figure 43-2. PIM-SM Sender Registration—Part1

As soon as an active source for group G sends a packet, the designated

router (DR) that is attached to this source is responsible for "Registering"

this source with the RP and requesting the RP to build a tree back to that

To do this, the source router encapsulates the multicast data from the

source in a special PIM-SM message, called the Register message, and

unicasts that data to the RP.

When the RP receives the Register message, it does two things:

It de-encapsulates the multicast data packet inside of the Register

message and forwards it down the Shared Tree.

Managing IPv4 and IPv6 Multicast

M8024 M6348 M8024-k