IPv6 PIM Sparse
IPv6 PIM Sparse
IPv6 Protocol Independent Multicast (PIM) Sparse is supported. IPv6 PIM Sparse provides multicasting that is especially suitable for widely distributed multicast environments.
In an IPv6 PIM Sparse network, an IPv6 PIM Sparse router that is connected to a host that wants to receive information for a multicast group must explicitly send a join request on behalf of the receiver (host).
FIGURE 10 Example IPv6 PIM Sparse domain
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
•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 10 on page 164, 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
164 | FastIron Ethernet Switch IP Multicast Configuration Guide |
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