Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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no ip pim snooping dr-flood

Disable the flooding of multicast packets to the PIM designated router.

Syntax

no ip pim snooping dr-flood

To re-enable the flooding of multicast packets to the PIM designated router, use the ip pim snooping dr-flood command.

Defaults

Enabled.

Command Modes

CONFIGURATION

Supported Modes

Full—Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
9.2(0.0)	Introduced on the MXL 10/40GbE Switch IO Module.

Usage Information

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 the multicast traffic, which belongs to a multicast group for which the switch receives a join request, on the port connected towards the designated router.

If the PIM DR flood is not disabled (default setting):

Multicast traffic is transmitted on the egress port towards the PIM DR if the port is not the incoming interface.
Multicast traffic for an unknown group is sent on the port towards the PIM DR. When DR flooding is disabled, multicast traffic for an unknown group is dropped.

Related Commands

ip pim sparse-mode — enables PIM-SM snooping.