Hi, openvswitch-2.5.0 seems to ignore IGMP queries with source IP 0.0.0.0 But, RFC seems to say the following: Highlighted in red. That switches shouldn't drop queries with source IP 0.0.0.0.
RFC 4541 IGMP and MLD Snooping Switches Considerations May 2006 This is not a problem in an IGMPv3-only network because there is no suppression of IGMP Membership reports. The administrative control allows IGMP Membership Report messages to be processed by network monitoring equipment such as packet analyzers or port replicators. The switch supporting IGMP snooping must maintain a list of multicast routers and the ports on which they are attached. This list can be constructed in any combination of the following ways: a) This list should be built by the snooping switch sending Multicast Router Solicitation messages as described in IGMP Multicast Router Discovery [MRDISC]. It may also snoop Multicast Router Advertisement messages sent by and to other nodes. b) The arrival port for IGMP Queries (sent by multicast routers) where the source address is not 0.0.0.0. The 0.0.0.0 address represents a special case where the switch is proxying IGMP Queries for faster network convergence, but is not itself the Querier. The switch does not use its own IP address (even if it has one), because this would cause the Queries to be seen as coming from a newly elected Querier. The 0.0.0.0 address is used to indicate that the Query packets are NOT from a multicast router. c) Ports explicitly configured by management to be IGMP-forwarding ports, in addition to or instead of any of the above methods to detect router ports. 2) IGMP networks may also include devices that implement "proxy- reporting", in which reports received from downstream hosts are summarized and used to build internal membership states. Such proxy-reporting devices may use the all-zeros IP Source-Address when forwarding any summarized reports upstream. For this reason, IGMP membership reports received by the snooping switch must not be rejected because the source IP address is set to 0.0.0.0. -Thanks
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