HP 7102dl - ProCurve Secure Router Configuration Manual page 660

Procurve secure router 7000dl series - advanced management and configuration guide

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Configuring Multicast Support with PIM-SM

If a group's prune list includes the specific source, the router deletes (or

schedules for deletion) the interface from the corresponding (S, G) entry's

outgoing interface list.

Receiving (S, G) RP-bit Prunes. The prune list for a group may include a

specific source marked with an RP-bit. The RP-bit indicates that even though

this prune includes a specific source, it deals with the RP tree.

A router would send such a prune to its upstream RP neighbor when the

upstream connection in its SP tree differs from that in its RP tree. The prune

instructs the upstream router to stop forwarding multicasts to the down-

stream router: this router is using a different connection to reach the source.

For example, in Figure 13-8, Router E has established an RP tree for multicast

traffic for a particular group before a source begins transmitting such traffic.

After Router E begins to receive multicasts, it constructs an SP tree to the

source. The RP and the SP tree diverge at Router C. Router C would send a

(S, G) RP-bit prune to Router D.

(S, G) RP-bit Prune

Figure 13-8. Sending an (S, G) RP-bit Prune

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