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PIM-SM (Sparse Mode)

Introduction

Feature Default CLI

Enable PIM-SM Support Disabled 4-26

Configure PIM-SM on VLAN

Interfaces

Disabled 4-28

Configure Router PIM Context

Bootstrap Router Candidate

Rendezvous-Point Candidate

Notification Traps

Shortest-Path Tree

Disabled

4-35

4-37

4-41

4-42

Display Multicast Route Data n/a 4-47

Display PIM-Specific Data n/a 4-51

Display PIM Neighbor Data n/a 4-57

Display BSR and C-RP Data n/a 4-59

Display Current RP-Set n/a 4-61

Display Candidate-RP Data n/a 4-63

In a network where IP multicast traffic is transmitted for multimedia applica-

tions, such traffic is blocked at routed interface (VLAN) boundaries unless a

multicast routing protocol is running. Protocol Independent Multicast (PIM)

is a family of routing protocols that form multicast trees to forward traffic

from multicast sources to subnets that have used a protocol such as IGMP to

request the traffic. PIM relies on the unicast routing tables created by any of

several unicast routing protocols to identify the path back to a multicast

source (reverse path forwarding, or RPF). With this information, PIM sets up

the distribution tree for the multicast traffic. The PIM-DM and PIM-SM proto-

cols on the switches covered by this manual enable and control multicast

traffic routing.

IGMP provides the multicast traffic link between a host and a multicast router

running PIM-SM. Both PIM-SM and IGMP must be enabled on VLANs whose

member ports have directly connected hosts with a valid need to join multicast

groups.

PIM-DM (described in chapter 3) is used in networks where, at any given time,

multicast group members exist in relatively large numbers and are present in

most subnets. However, using PIM-DM in networks where multicast sources

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