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Switching Configuration 43
Multicast Packets Received..................... 626494
Broadcast Packets Received..................... 0
console#show statistics ethernet 1/g10
...
Total Packets Received Without Errors.......... 12
Unicast Packets Received....................... 0
Multicast Packets Received..................... 12
Broadcast Packets Received..................... 0
IGMP Snooping Querier
When PIM and IGMP are enabled in a network with IP multicast routing, the IP multicast router acts as
the IGMP querier. However, if the IP-multicast traffic in a VLAN needs to be Layer 2 switched only, an
IP-multicast router is not required. The IGMP Snooping Querier can perform the IGMP snooping
functions on the VLAN.
NOTE: Without an IP-multicast router on a VLAN, you must configure another switch as the IGMP querier so that it
can send queries.
When the IGMP snooping querier is enabled, the IGMP snooping querier sends out periodic IGMP
queries that trigger IGMP report messages from the switch that wants to receive IP multicast traffic. The
IGMP snooping feature listens to these IGMP reports to establish appropriate forwarding.
CLI Examples
The following examples show commands to use with the IGMP Snooping Querier feature.
Example #1: Enable IGMP Snooping Querier on the Switch
The first command in this example enables the IGMP snooping querier on the switch. The second
command specifies the IP address that the snooping querier switch should use as the source address
when generating periodic queries.
console(config)#ip igmp snooping
console(config)#ip igmp snooping querier
console(config)#ip igmp snooping querier address 10.10.20.12
NOTE: The IGMP snooping feature must be enabled for the IGMP snooping querier function to operate.