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Disabling IGMP snooping
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).
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If you cannot disable IGMP snooping from the VLAN, you need to configure an IGMP querier for your cluster's multicast group(s).
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WarningEnabling IGMP snooping without an IGMP querier results in nodes that cannot communicate with each other. |
See your router documentation for details on enabling an IGMP querier.
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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 previously 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.