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