Electing An Rp Using The Bsr Mechanism; Enabling Rp To Server Specific Multicast Groups - Dell S6100 Configuration Manual

Electing an RP using the BSR Mechanism

Every PIM router within a domain must map a particular multicast group address to the same RP. The group-to-RP mapping may be
statically or dynamically configured. RFC 5059 specifies a dynamic, self-configuring method called the Bootstrap Router (BSR) mechanism,
by which an RP is elected from a pool of RP candidates (C-RPs).
Some routers within the domain are configured to be C-RPs. Other routers are configured to be Bootstrap Router candidates (C-BSRs);
one router is elected the BSR for the domain and the BSR is responsible for forwarding BSM containing RP-set information to other
routers.
The RP election process is as follows:
1 C-BSRs flood their candidacy throughout the domain in a BSM. Each message contains a BSR priority value, and the C-BSR with the
highest priority value becomes the BSR.
2 Each C-RP unicasts periodic Candidate-RP-Advertisements to the BSR. Each message contains an RP priority value and the group
ranges for which it is a C-RP.
3 The BSR determines the most efficient and stable group-to-RP mappings, which is called the RP-Set.
4 The BSR floods the RP-Set throughout the domain periodically in case new C-RPs are announced, or an RP failure occurs.
To enable RP election, perform the following steps:
1 Enter the following command to make a PIM router a BSR candidate:
CONFIGURATION
ip pim bsr-candidate
2 Enter the following command to make a PIM router a RP candidate:
CONFIGURATION
ip pim rp-candidate
3 Display Bootstrap Router information.
EXEC Privilege
show ip pim bsr-router

Enabling RP to Server Specific Multicast Groups

When you configure an RP candidate, its advertisement is sent to the entire multicast address range and the group-to-RP mapping is
advertised for the entire range of multicast address. Starting with Dell Networking OS 9.11.0.0, you can configure an RP candidate for a
specified range of multicast group address.
The Configured multicast group ranges are used by the BSR protocol to advertise the candidate RPs in the bootstrap messages.
You can configure the multicast group ranges as a standard ACL list of multicast prefixes. You can then associate the configured group list
with the RP candidate.
NOTE: • If there is no multicast group list configured for the RP-candidate, the RP candidate will be advertised for all the
multicast groups.
To enable an RP to serve specific group of multicast addresses, perform the following step:
Enter the following command to associate a multicast group to an RP candidate:
CONFIGURATION
PIM Source-Specific Mode (PIM-SSM) 657