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772 | PIM Sparse-Mode
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PIM-SM Snooping Configuration
You can enable PIM-SM snooping globally on a switch or on individual VLANs. PIM-SM snooping is not
enabled by default and does not require an IP address, PIM-DM, or PIM-SM.
PIM-SM snooping and PIM multicast routing are mutually exclusive: PIM-SM snooping cannot be
enabled on a switch/router if PIM-SM or PIM-DM is enabled.
If enabled at the global level, PIM-SM snooping is automatically enabled on all VLANs on the switch
unless the
no ip pim snooping command has been entered on a VLAN interface.
If enabled at the VLAN level, PIM-SM snooping requires that you also enter the
no shutdown command to
enable the interface.
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:
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