Switching From An Rp To An Sp Tree - HP 7102dl - ProCurve Secure Router Configuration Manual

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

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Multicast host

Figure 13-2. Joining a Shared, or RP, Tree

Switching from an RP to an SP Tree

Once a router begins to receive a multicast stream along the RP tree, it can

change to an SP tree. In networks with many alternate paths or connections

with varying bandwidth, the path through the SP tree may be quicker than that

through the RP tree.

PIM-SM allows various methods for determining when a router should switch

from the RP to an SP tree. A ProCurve Secure Router switches to the SP tree

after it receives a certain number of multicast packets from a source. By

default, the router begins to build the SP tree after it receives one packet, or,

in effect, as soon as it receives a multicast for a group. (You can alter this

The exception to the rule that only edge routers can initiate the switch to an

SP is that the RP itself must switch to an SP tree. The J-bit in the (*, G) entry

signals the RP to join the SP tree as soon as it receives a register packet from

Configuring Multicast Support with PIM-SM

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