Administrator Guide

PIM Sparse-Mode (PIM-SM)
Dell Networking OS supports protocol-independent multicast sparse-mode (PIM-SM).
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-SM
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
Be aware of the following PIM-SM implementation information.
The Dell Networking implementation of PIM-SM is based on IETF Internet Draft draft-ietf-pim-sm-v2-
new-05.
FN IOM supports a maximum of 31 PIM interfaces and 2K multicast entries including (*,G), and (S,G)
entries. There is no limit on the number of PIM neighbors FN IOM can have.
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 operating system (OS) reduces the number of control messages sent between
multicast routers by bundling Join and Prune requests in the same message.
The Dell Networking OS supports PIM-SM on physical, virtual local area network (VLAN), and port-
channel interfaces.
The Dell Networking OS supports 2000 IPv6 multicast forwarding entries, with up to 128 PIM-source-
specific multicast (SSM) neighbors/interfaces.
IPv6 Multicast is not supported on synchronous optical network technologies (SONET) interfaces.
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