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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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To help identify cluster networks where IGMP snooping is enabled without an IGMP querier, a node will log a critical error on the Swarm Admin Console and in the syslog, recommending administrators check for the presence of IGMP snooping. The node does this when these conditions occur:
- It could previously multicast multicasted to a node.
- It can no longer multicast to that node.
- It can still unicast to that node.
By default, Swarm uses IGMPv2 responses to host membership queries. The igmpVersion parameter can be used to force the use of version 1, 2, or 3.