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Managed switches may implement IGMP snooping to direct multicast traffic to their ports. The purpose of IGMP snooping is to block unnecessary multicast traffic from hosts who are not interested in the traffic. The switch will only forward multicast traffic out to ports where it heard an IGMP join message within a configurable time (typically around 5 minutes).
However, Swarm nodes should are recommended to exist in their own a separate private VLAN so that there are no other hosts in the broadcast domain. You should disable Disable IGMP snooping from the Swarm nodes' VLAN because there is no benefit to having IGMP snooping configured in a VLAN that only includes Swarm products.
If you cannot disable IGMP snooping from the VLAN, you need to configure Configure an IGMP querier for your cluster's multicast group(s) f you cannot disable IGMP snooping from the VLAN.
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WarningEnabling IGMP snooping without an IGMP querier results in nodes that cannot communicate with each other. |
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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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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.