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Some switches are configured to act as IGMP queriers in an IPv4 network for multicast group memberships, but other switches are not unless configured appropriately. Since multicast routing is not configured by default on all switches, an IGMP querier may not exist on the network unless one has been specifically configured.
Swarm can be configured to perform this function if a querier is not available in the network. Swarm elects a node in the cluster to act as an IGMP querier when configured, guaranteeing multicast membership queries are sent so cluster operation can continue. The Swarm IGMP querier has no impact on networks with IGMP Snooping disabled.
To enable an IGMP querier on the Swarm cluster itself, set it via the SNMP MIB entry networkIGMPTimeout and enable the network.igmpTimeout configuration parameter in Swarm.
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Swarm uses IGMPv2 responses to host membership queries by default. The igmpVersion parameter can be used to force the use of version 1, 2, or 3.