Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 664
PIM Sparse-Mode (PIM-SM), Implementation Information, Protocol Overview, Requesting Multicast Traffic
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37 PIM Sparse-Mode (PIM-SM) Protocol-independent multicast sparse-mode (PIM-SM) is a multicast protocol that forwards multicast traffic to a subnet only after a request using a PIM Join message; this behavior is the opposite of PIM-Dense mode, which forwards multicast traffic to all subnets until a request to stop. Topics: • Implementation Information • Protocol Overview • Configuring PIM-SSM • Enable PIM-SM • Configuring S,G Expiry Timers • Configuring a Static Rendezvous Point • Configuring a Designated Router • Creating Multicast Boundaries and Domains • Enabling PIM-SM Graceful Restart Implementation Information The Dell Networking implementation of PIM-SM is based on IETF Internet Draft draft-ietf-pim-sm-v2-new-05. • The maximum number of PIM interfaces is 95. • The SPT-Threshold is zero, which means that the last-hop designated router (DR) joins the shortest path tree (SPT) to the source after receiving the first multicast packet. • The Dell Networking OS reduces the number of control messages sent between multicast routers by bundling Join and Prune requests in the same message. • The system supports PIM-SM on physical, virtual local area network (VLAN), and port-channel interfaces. • The system supports up to 128 PIM-source-specific multicast (SSM) neighbors/interfaces. • IPv6 Multicast is not supported on synchronous optical network technologies (SONET) interfaces. Protocol Overview PIM-SM initially uses unidirectional shared trees to forward multicast traffic; that is, all multicast traffic must flow only from the rendezvous point (RP) to the receivers. After a receiver receives traffic from the RP, PM-SM switches to SPT to forward multicast traffic. Every multicast group has an RP and a unidirectional shared tree (group-specific shared tree). Requesting Multicast Traffic A host requesting multicast traffic for a particular group sends an Internet group management protocol (IGMP) Join message to its gateway router. The gateway router is then responsible for joining the shared tree to the RP (RPT) so that the host can receive the requested traffic. PIM Sparse-Mode (PIM-SM) 664
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