The report is addressed to the desired multicast group. A client has to join the group periodically by sending a Membership Report or it will be assumed that he has left the group after some short timeout. IGMPv3; IGMPv3 Host Stack; IGMPv3. IGMP is an asymmetric protocol and is specified here from the point of view of a host, rather than a multicast router. Information About IGMPv3 Host Stack. The device must be configured for SSM. 4. In a captured network trace, the destination IPv4 address differs from the multicast address in the IGMP v1 membership report. Membership in this group is automatic. Send an IGMP Membership Report (aka IGMP Join) to register as an interested listener. Periodically send The IGMP Membership Report until a general query is received. However, those reports are usually sent only when receiving a Membership Query from the local multicast router. Internet Group Management Protocol (IGMP) is the protocol used by IPv4 devices to report their IP multicast group memberships to neighboring multicast devices. IGMP snooping is a process to listen to the IGMP network traffic in controlled manner. RFC 3376 IGMPv3 October 2002 There are two IGMP message types of concern to the IGMPv3 protocol described in this document: Type Number (hex) Message Name ----- ----- 0x11 Membership Query 0x22 Version 3 Membership Report An implementation of IGMPv3 MUST also support the following three message types, for interoperation with previous versions of IGMP (see section 7): 0x12 Version 1 Membership … L2 or Level-2 devices such as switches are used in between host and multicast router for IGMP snooping. The host initiating the transmission sends a message (called an IGMP Membership Report) to the 224.0.0.2 address (all multicast routers) specifying the multicast group address. 5. IGMPv3 membership reports are sent for SSM channels only. Basic of IGMP An IGMP-enabled router sends out several General Membership Queries at startup(224.0.0.1) Hosts that are members of specific multicast groups send Membership Reports back to the router to report their membership. * Multicast address to MAC address mapping Multicast MAC addresses have been assigned a standard 24-bit prefix of 01:00:5e. Therefore, applications or services that use the Internet Group Management Protocol (IGMP) v1 protocol are dropped by the router from the multicast group and do not receive any more traffic. This is the way multicast / the IGMP protocol works. RFC 1054, pages 10 through 13: The Internet Group Management Protocol (IGMP(v0)) is used by IP hosts to report their host group memberships to any immediately-neighboring multicast routers. The host initiating the transmission sends a message (called an IGMP Membership Report) to the 224.0.0.2 address (all multicast routers) specifying the multicast group address. To join a group, the host sends an IGMP membership report packet through an attached interface. The switch receives this message, adds the multicast group to its table, and adds the receiving port as a member of the group. Switch receives the message from host and forwards the membership report to … IGMP version 1. IGMPv3 specific host operations Either your clients don't receive the query or don't respond with a report. IGMP Version 2 uses the following 4 types of IGMP messages: Membership query; Version 1 membership report; Version 2 membership report; Leave group; Working of Version 2 is pretty close to that of Version 1, however one major enhancement in v2 being the addition of leave group message. The switch receives this message, adds the multicast group to its table, and adds the receiving port as a member of the group. A host does not need to join the all hosts group (224.0.0.1).
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