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152 Multi-Service IronWare Multicast Configuration Guide

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IPv6 PIM Sparse

PIM Sparse router types

Routers that are configured with PIM Sparse interfaces also can be configured to fill one or more of

the following roles:

• BSR – The Bootstrap Router (BSR) distributes RP information to the other PIM Sparse routers

within the domain. Each PIM Sparse domain has one active BSR. For redundancy, you can

configure ports on multiple routers as candidate BSRs. The PIM Sparse protocol uses an

election process to select one of the candidate BSRs as the BSR for the domain. The BSR with

the highest BSR priority (a user-configurable parameter) is elected. If the priorities result in a

tie, then the candidate BSR interface with the highest IP address is elected. In the example in

Figure 19, PIM Sparse router B is the BSR. Port 2/2 is configured as a candidate BSR.

• RP – The Rendezvous Points (RP) is the meeting point for PIM Sparse sources and receivers. A

PIM Sparse domain can have multiple RPs, but each PIM Sparse multicast group address can

have only one active RP. PIM Sparse routers learn the addresses of RPs and the groups for

which they are responsible from messages that the BSR sends to each of the PIM Sparse

routers. In the example in Figure 19, PIM Sparse router B is the RP. Port 2/2 is configured as a

candidate Rendezvous Point (RP).

To enhance overall network performance, the device uses the RP to forward only the first

packet from a group source to the group receivers. After the first packet, the device calculates

the shortest path between the receiver and the source (the Shortest Path Tree, or SPT) and

uses the SPT for subsequent packets from the source to the receiver. The device calculates a

separate SPT for each source-receiver pair.

NOTE

It is recommended that you configure the same ports as candidate BSRs and RPs.

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Brocade Multi-Service IronWare Multicast Configuration Gui Bedienungsanleitung Seite 164