Disabling Pim Snooping Designated-Router Flooding - Cisco 7604 Configuration Manual

Configuring PIM Snooping
Command
Step 3
Router(config-if)# end
Step 4
Router# show ip pim snooping
This example shows how to enable PIM snooping on VLAN 10 and verify the configuration:
Router# interface vlan 10
Router(config-if)# ip pim snooping
Router(config-if)# end
Router# show ip pim snooping vlan 10
3 neighbors (0 DR priority incapable, 0 Bi-dir incapable)
6 mroutes, 3 mac entries
DR is 10.10.10.4
RP DF Set
Router#

Disabling PIM Snooping Designated-Router Flooding

Note •
•
By default, routers that have PIM snooping enabled will flood multicast traffic to the designated router
(DR). This method of operation can send unnecessary multicast packets to the designated router. The
network must carry the unnecessary traffic, and the designated router must process and drop the
unnecessary traffic.
To reduce the traffic sent over the network to the designated router, disable designated-router flooding.
With designated-router flooding disabled, PIM snooping only passes to the designated-router traffic that
is in multicast groups for which PIM snooping receives an explicit join from the link towards the
designated router.
To disable PIM snooping designated-router flooding, perform this task:
Command
Step 1
Router(config)# no ip pim snooping dr-flood
Step 2
Router(config)# end
Step 3
Router# show running-config | include dr-flood
This example shows how to disable PIM snooping designated-router flooding:
Router(config)# no ip pim snooping dr-flood
Router(config)# end
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
31-6
The PIM snooping DR flooding enhancement is supported with:
Release 12.2(18)SXF and later releases on Supervisor Engine 720
–
Release 12.2(18)SXF2 and later releases on Supervisor Engine 32 and Supervisor Engine 2
–
Do not disable designated-router flooding on routers in a Layer 2 broadcast domain that supports
multicast sources.
Chapter 31
Purpose
Exits configuration mode.
Verifies the configuration.
Purpose
Disables PIM snooping designated-router flooding.
Exits configuration mode.
Verifies the configuration.
Configuring PIM Snooping
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