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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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It previously multicasted to a node.
It can no longer multicast to that node.
It can still unicast unicasts to that node.
By default, 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.