Cisco 7604 User Manual

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 31 Configuring PIM Snooping
Configuring 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 • 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.
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:
This example shows how to disable PIM snooping designated-router flooding:
Router(config)# no ip pim snooping dr-flood
Router(config)# end
Step 3
Router(config-if)# end
Exits configuration mode.
Step 4
Router# show ip pim snooping
Verifies the configuration.
Command Purpose
Command Purpose
Step 1
Router(config)# no ip pim snooping dr-flood
Disables PIM snooping designated-router flooding.
Step 2
Router(config)# end
Exits configuration mode.
Step 3
Router# show running-config | include dr-flood
Verifies the configuration.

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English