Reference Guide

PIM Sparse-Mode | 725
Enable PIM Snooping
To enable PIM-SM snooping on all VLAN interfaces on a switch, enter the following command.
To enable PIM-SM snooping on a VLAN interface, enter the following commands:
Disable PIM Designated-Router Flooding
By default, when you enable PIM-SM snooping, a switch floods all multicast traffic to the PIM designated
router (DR), including unnecessary multicast packets. To minimize the traffic sent over the network to the
designated router, you can disable designated-router flooding.
When designated-router flooding is disabled, PIM-SM snooping only forwards multicast traffic, which
belongs to a multicast group for which the switch receives a join request, on the port connected towards the
designated router.
To disable designated-router flooding for PIM-SM snooping, enter the
no ip pim snooping dr-flood
command:
Verify PIM-SM Snooping
To display information about PIM-SM snooping operation, enter one of the following show commands:
Task Command Command Mode
Enable PIM-SM snooping globally on a switch. ip pim snooping enable CONFIGURATION
Task Command Command Mode
Enable PIM-SM snooping on a VLAN interface. ip pim snooping VLAN INTERFACE
Enable the interface. no shutdown VLAN INTERFACE
Task Command Command Mode
Disable flooding of multicast packets to the designated-router. no ip pim snooping dr-flood CONFIGURATION
Task Command Command Mode
Display information about PIM neighbors
discovered by PIM-SM snooping.
show ip pim snooping neighbor [vlan
vlan-id]
PIM-SM snooping: show ip pim snooping
neighbor
EXEC Privilege
Display information about PIM group members
and states stored in the tree information base
(TIB) that was discovered by PIM-SM snooping.
show ip pim snooping tib [vlan vlan-id]
[group-address [source-address]]
PIM-SM snooping: show ip pim snooping
tib
EXEC Privilege