30-9
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 30 Configuring IGMP Snooping for IPv4 Multicast Traffic
Enabling the IGMP Snooping Querier
Enabling the IGMP Snooping Querier
Use the IGMP snooping querier to support IGMP snooping in a VLAN where PIM and IGMP are not
configured because the multicast traffic does not need to be routed.
To enable the IGMP snooping querier in a VLAN, perform this task:
This example shows how to enable the IGMP snooping querier on VLAN 200 and verify the
configuration:
Router# interface vlan 200
Router(config-if)# ip address 172.20.52.106 255.255.255.248
Router(config-if)# igmp snooping querier
Router(config-if)# end
Router# show ip igmp interface vlan 200 | include querier
IGMP snooping fast-leave (for v2) is disabled and querier is enabled
Router#
Configuring IGMP Snooping
Note To use IGMP snooping, configure a Layer 3 interface in the subnet for multicast routing (see Chapter 28,
“Configuring IPv4 Multicast Layer 3 Switching”) or enable the IGMP snooping querier in the subnet
(see the “Enabling the IGMP Snooping Querier” section on page 30-9).
IGMP snooping allows Cisco 7600 series routers to examine IGMP packets and make forwarding
decisions based on their content.
These sections describe how to configure IGMP snooping:
• Enabling IGMP Snooping, page 30-10
• Configuring a Static Connection to a Multicast Receiver, page 30-11
• Configuring a Multicast Router Port Statically, page 30-11
• Configuring the IGMP Snooping Query Interval, page 30-11
• Enabling IGMP Fast-Leave Processing, page 30-12
• Configuring Source Specific Multicast (SSM) Mapping, page 30-12
• Enabling SSM Safe Reporting, page 30-13
Command Purpose
Step 1
Router(config)# interface vlan
vlan_ID
Selects the VLAN interface.
Step 2
Router(config-if)# ip address
ip_address
subnet_mask
Configures the IP address and IP subnet.
Step 3
Router(config-if)# ip igmp snooping querier
Enables the IGMP snooping querier.
Router(config-if)# no ip igmp snooping querier
Disables the IGMP snooping querier.
Step 4
Router(config-if)# end
Exits configuration mode.
Step 5
Router# show ip igmp interface vlan
vlan_ID
|
include querier
Verifies the configuration.
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