Pim Sparse-Mode (Pim-Sm); Implementation Information; Protocol Overview - Dell C9000 Series Networking Configuration Manual

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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.

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-

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).

PIM Sparse-Mode (PIM-SM)