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In 2002, IGMPv3 improved IGMPv2 by supporting source-specific multicast [9] and introduces membership report aggregation. [10] The support for source-specific multicast was improved in 2006. [11] The three versions of IGMP are backward compatible. A router supporting IGMPv3 can support clients running IGMPv1, IGMPv2, and IGMPv3.
Interest in multicast traffic from a specific source is conveyed from hosts to routers using IGMPv3 as specified in RFC 4607. SSM destination addresses must be in the ranges 232.0.0.0/8 for IPv4 . For IPv6 current allowed SSM destination addresses are specified by ff3x::/96 , where the hexadecimal digit x represents the scope. [ 1 ]
IGMPv2 and IGMPv3 contain provision for selecting a querier when multiple are available. The querier with the lowest IP address is given the role. [2] [3] IGMP general queries from the querier must be unconditionally forwarded by all switches involved in IGMP snooping. [1]
A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service.
IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. It is the IP-specific form of multicast and is used for streaming media and other network applications.
Differentiated services or DiffServ is a computer networking architecture that specifies a mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks.
Protocol Independent Multicast - Sparse-Mode (PIM-SM) is a protocol for efficiently routing Internet Protocol (IP) packets to multicast groups that may span wide-area and inter-domain internets.
Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS).