Administrator Guide

Table 64. Preventing a Host from Joining a Group — Description (continued)
Location Description
2/11
● Interface TenGigabitEthernet 2/11
● ip pim sparse-mode
● ip address 10.11.12.2/24
● no shutdown
2/31
● Interface TenGigabitEthernet 2/31
● ip pim sparse-mode
● ip address 10.11.23.1/24
● no shutdown
3/1
● Interface TenGigabitEthernet 3/1
● ip pim sparse-mode
● ip address 10.11.5.1/24
● no shutdown
3/11
● Interface TenGigabitEthernet 3/11
● ip pim sparse-mode
● ip address 10.11.13.2/24
● no shutdown
3/21
● Interface TenGigabitEthernet 3/21
● ip pim sparse-mode
● ip address 10.11.23.2/24
● no shutdown
Receiver 1
● Interface VLAN 300
● ip pim sparse-mode
● ip address 10.11.3.1/24
● untagged TenGigabitEthernet1/1
● no shutdown
Receiver 2
● Interface VLAN 400
● ip pim sparse-mode
● ip address 10.11.4.1/24
● untagged TenGigabitEthernet 1/2
● 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 Features
573