IGMP is an asymmetric protocol and is specified here from the point of view of a host, rather than a multicast router. In a captured network trace, the destination IPv4 address differs from the multicast address in the IGMP v1 membership report. The switch receives this message, adds the multicast group to its table, and adds the receiving port as a member of the group. IGMPv3; IGMPv3 Host Stack; IGMPv3. IGMP version 1. L2 or Level-2 devices such as switches are used in between host and multicast router for IGMP snooping. 5. The device must be configured for SSM. The report is addressed to the desired multicast group. 4. IGMPv3 specific host operations The switch receives this message, adds the multicast group to its table, and adds the receiving port as a member of the group. Membership in this group is automatic. 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. 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. Either your clients don't receive the query or don't respond with a report. * Multicast address to MAC address mapping Multicast MAC addresses have been assigned a standard 24-bit prefix of 01:00:5e. Periodically send The IGMP Membership Report until a general query is received. Internet Group Management Protocol (IGMP) is the protocol used by IPv4 devices to report their IP multicast group memberships to neighboring multicast devices. 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. Information About IGMPv3 Host Stack. 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. 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. 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. However, those reports are usually sent only when receiving a Membership Query from the local multicast router. 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. 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 … IGMPv3 membership reports are sent for SSM channels only. This is the way multicast / the IGMP protocol works. A host does not need to join the all hosts group (224.0.0.1). Send an IGMP Membership Report (aka IGMP Join) to register as an interested listener. IGMP snooping is a process to listen to the IGMP network traffic in controlled manner. 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