Source-Specific Multicast for IP
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IP addresses in the 232/8 (232.0.0.0 to 232.255.255.255) range are
designated as source-specific multicast (SSM) destination addresses
and are reserved for use by source-specific applications and protocols
[IANA-ALLOCATION]. For IP version 6 (IPv6), a proposed range exists,
although there is currently no IANA allocation [SSMIPv6]. This
document defines the semantics of source-specific multicast addresses
and specifies the policies governing their use. It defines an
extension to the Internet network service that applies to datagrams
sent to SSM addresses and defines the host and router requirements to
support this extension. A companion document will describe how the
Internet Group Management Protocol Version 3 [IGMPv3] and the
Multicast Listener Discovery Protocol Version 2 [MLDv2] can be adapted
to support source-specific multicast.