Command Reference Guide

1120 | PIM-Sparse Mode (PIM-SM)
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Syntax
no ip pim snooping
dr-flood
To re-enable the flooding of multicast packets to the PIM designated router, enter the ip pim
snooping
dr-flood command.
Defaults
Enabled.
Command Modes
CONFIGURATION
Command
History
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
show ip pim bsr-router
c e s
View information on the Bootstrap router.
Syntax
show ip pim bsr-router
Command Modes
EXEC
EXEC Privilege
Command
History
Example
E600-7-rpm0#show ip pim bsr-router
PIMv2 Bootstrap information
Version 8.3.12.0 Introduced on the S4810.
Version 8.4.1.1 Introduced on E-Series ExaScale
ip pim snooping Enable PIM-SM snooping.
Version 8.3.7.0 Introduced on S4810
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.8.1.0 Introduced on S-Series