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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Configuring the Switch as Querier

To configure the switch as a querier, use the following command.

Hosts that do not support unsolicited reporting wait for a general query before sending a membership report. When the multicast source and receivers are in the same VLAN, multicast traffic is not routed and so there is no querier. Configure the switch to be the querier for a VLAN so that hosts send membership reports and the switch can generate a forwarding table by snooping.
Configure the switch to be the querier for a VLAN by first assigning an IP address to the VLAN interface.
INTERFACE VLAN mode
ip igmp snooping querier
IGMP snooping querier does not start if there is a statically configured multicast router interface in the VLAN.
The switch may lose the querier election if it does not have the lowest IP address of all potential queriers on the subnet.
When enabled, IGMP snooping querier starts after one query interval in case no IGMP general query (with IP SA lower than its VLAN IP address) is received on any of its VLAN members.

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