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Location Description

• ip pim sparse-mode

• ip address 10.11.4.1/24

• untagged TenGigabitEthernet 1/2/1

• ip igmp access-group igmpjoinfilR2G2

• no shutdown

Preventing a PIM Router from Forming an Adjacency

To prevent a router from participating in PIM (for example, to configure stub multicast routing), use the

following command.

• Prevent a router from participating in PIM.

INTERFACE mode

ip pim neighbor-filter

Setting a Threshold for Switching to the SPT

The functionality to specify a threshold for switchover to the shortest path trees (SPTs) is available on the

system. 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).

The SPT-Threshold is zero, which means that the last-hop designated router (DR) joins the shortest path tree

(SPT) to the source upon receiving the first multicast packet.

Initially, a single PIM-SM tree called a shared tree to distribute traffic. It is called shared because all traffic for

the group, regardless of the source, or the location of the source, must pass through the RP. The shared tree

is unidirectional; that is, all multicast traffic flows only from the RP to the receivers. Once a receiver receives

traffic from the RP, PM-SM switches to SPT to forward multicast traffic, which connects the receiver directly

to the source.

You can configure PIM to switch over to the SPT when the router receives multicast packets at or beyond a

specified rate.

Table 62. Configuring PIM to Switch Over to the SPT

IPv4 Configure PIM to switch over to the SPT when the

multicast packet rate is at or beyond a specified

rate. The keyword infinity directs PIM to never

switch to the SPT.

ip pim spt-threshold

{| infinity}

CONFIGURATION

IPv6 Configure PIM to switch over to the SPT when the