TP-LINK JetStream Dokumentacja Pobierz pdf (Strona 263)

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Figure 11-16 The Locations of C-R P, C-BSR and BSR

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RPT Building

Figure 11-17 RPT Topology in PIM SM

As shown in Figure 11-17, the establishing process of RPT is illustrated below:

(1) When a receiver joins a multicast group G, it informs the directly connected DR with IGMP

message;

(2) After receiving the IGMP message from multicast group G, the DR sends PIM join message

toward the corresponding root, also known as the RP;

(3) The join message travels router-by-router toward the root, constructing a branch of the RPT

as it goes. These routers generate (*, G) entries in their forwarding tables with * representing

any multicast source. The RPT works with RP as the root node, and DR as the branch node.

When multicast data for multicast group G is sent to RP, it will travels along the constructed RPT

to DR and finally arrives at the receivers.

When a receiver is no longer interested in the multicast group data, its directly connected DR will

send prune message up the RPT toward the group’s corresponding RP; after the upstream node

receives this prune message, it will delete the link to the downstream node in its interface list and

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