Dell Command Line Reference Guide for the S4048–ON System 9.14.2.5

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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
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000-ON.
9.5(0.1)
Introduced on the Z9500.
8.3.19.0
Introduced on the S4820T.
8.3.12.0
Introduced on the S4810.
8.4.1.0
Introduced on the E-Series.
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.

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