Administrator Guide

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,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version
8.3.19.0
Introduced on the S4820T.
Version
8.3.12.0
Introduced on the S4810.
Version 8.4.1.0 Introduced on the E-Series ExaScale.
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.
PIM-Sparse Mode (PIM-SM)
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