PIM-SM (Sparse Mode)
Terminology
software covered in this guide.) Note that BSR operation does not extend
to statically configured RPs. (For more on this topic, refer to “Static
Rendezvous Point (Static-RP)” on page 4-17.)
■ IGMP Compatibility: PIM-SM is compatible with IGMP version 2, and is
fully interoperable with IGMP for determining multicast flows.
■ VRRP: PIM-SM is fully interoperable with VRRP to quickly transition
multicast routes in the event of a failover.
■ MIB Support on the Routers Covered by this Guide:
• PIM-SM supports the Protocol Independent Multicast MIB for IPv4
(RFC 2934).
• With some exceptions, PIM-SM supports the parts of the Multicast
Routing MIB (RFC 2932) applicable to PIM-SM operation. (Refer to
“Exceptions to Support for RFC 2932 - Multicast Routing MIB” on
page 3-42.)
■ PIM Draft Specifications: Compatible with PIM-SM draft specification
(RFC 2362, version 10).
Terminology
Bootstrap Router (BSR). In a given PIM-SM domain, the BSR is the router
elected to distribute the RP-set to the candidate rendezvous points
(C-RPs) in a PIM-SM domain. The BSR does not interact with static rendezvous
points (static-RPs) For more information on BSRs, refer to “Bootstrap Router
(BSR)” on page 4-13. See also “RP-Set”, below.
Bootstrap Message (BSM): A message sent from the current BSR to the
other PIM-SM routers in the domain to distribute the current RP-set and the
status of the sending BSR as the current bootstrap router.
Candidate Rendezvous Point (C-RP): A PIM-SM router configured as
the distribution point for all traffic from a multicast traffic source to a
particular multicast group (destination). Multiple C-RPs can be configured to
support the same multicast group, but only one C-RP will be elected to actually
distribute the traffic for that group. (See also Rendezvous Point, page 4-7.)
Dynamic RP: A PIM-SM router configured as a Candidate Rendezvous Point
(C-RP).
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