![]() ![]() A router supporting IGMPv3 can support clients running IGMPv1, IGMPv2 and IGMPv3. IGMPv3 improves IGMPv2 by supporting source-specific multicast and introduces membership report aggregation. IGMPv2 improves IGMPv1 by adding the ability for a host to signal desire to leave a multicast group. RFC 4604 updates both IGMPv3 and MLDv2 to better support source-specific multicast. IGMPv1 is defined by RFC 1112, IGMPv2 is defined by RFC 2236 and IGMPv3 was initially defined by RFC 3376. ![]() IGMP is vulnerable to some attacks, and firewalls commonly allow the user to disable it if not needed. Some multilayer switches include an IGMP querier capability to allow their IGMP snooping features to work in the absence of an IGMP-capable router in the layer 2 network. A single router per subnet is elected to perform this querying function. A host requests membership to a group through its local router while a router listens for these requests and periodically sends out subscription queries. The IGMP protocol is implemented on hosts and within routers. IGMP operates on the network layer (layer 3), just the same as other network management protocols like ICMP. Protocol Independent Multicast (PIM) is then used between the local and remote multicast routers to direct multicast traffic from hosts sending multicasts to hosts that have registered through IGMP to receive them. ![]() Switches featuring IGMP snooping also derive useful information by observing these IGMP transactions. IGMP operates between a host and a local multicast router. Multicast management on IPv6 networks is handled by Multicast Listener Discovery (MLD) which is a part of ICMPv6 in contrast to IGMP's bare IP encapsulation.Ī network designed to deliver a multicast service using IGMP might use this basic architecture: IGMP can be used for one-to-many networking applications such as online streaming video and gaming, and allows more efficient use of resources when supporting these types of applications. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them. The Internet Group Management Protocol ( IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. ![]()
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