Web-based Configuration Guide L2 Multicast
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5.7 Setting an IGMP Querier
5.7.1 Overview
In a three-layer multicast network, the L3 multicast device serves as the querier and runs IGMP to maintain
group membership. L2 multicast devices only need to listen to IGMP packets to establish and maintain
forwarding entries and implement L2 multicasting. When a multicast source and user host are in the same L2
network, the query function is unavailable because the L2 device does not support IGMP. To resolve this problem,
you can configure the IGMP snooping querier function on the L2 device so that the L2 device sends IGMP Query
packets to user hosts on behalf of the L3 multicast device, and listens to and maintains IGMP Report packets
responded by user hosts to establish L2 multicast forwarding entries.
5.7.2 Procedure
Choose Local Device > L2 Multicast > Querier.
One querier is set for each VLAN. The number of queriers is the same as that of device VLANs.
In Querier List, click Edit in the last Action column. In the displayed dialog box, select whether to enable the
querier, set the querier version, querier source IP address, and packet query interval, and click OK.
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