Source-specific multicast is best understood in contrast to any-source multicast (ASM). In the ASM service model a receiver expresses interest in traffic to a multicast address. The multicast network must
This behavior is particularly well suited to groupware applications where
The source discovery burden on the network can become significant when the number of sources is large.
In the SSM service model, in addition to the receiver expressing interest in traffic to a multicast address, the receiver expresses interest in receiving traffic from only one specific source sending to that multicast address. This relieves the network of discovering many multicast sources and reduces the amount of multicast routing information that the network must maintain.
SSM requires support in last-hop routers and in the receiver's operating system. SSM support is not required in other network components, including routers and even the sending host. Interest in multicast traffic from a specific source is conveyed from hosts to routers using IGMPv3 as specified in RFC 3376.
US Patent Issued to Cisco Technology on May 3 for "Source Specific Multicast Group to Source Mapping" (Belgian, Spanish Inventors)
May 06, 2011; ALEXANDRIA, Va., May 6 -- United States Patent no. 7,936,752, issued on May 3, was assigned to Cisco Technology Inc. (San Jose,...
Happy 10th Birthday, DOCSIS.(Data Over Cable Service Interface Specification)(Cable Television Laboratories Inc.)
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US Patent Issued to Samsung Electronics on Aug. 24 for "Join Message Load Control System and Method in Network Using PIM-SSM" (South Korean Inventor)
Aug 25, 2010; ALEXANDRIA, Va., Aug. 31 -- United States Patent no. 7,782,799, issued on Aug. 24, was assigned to Samsung Electronics Co. Ltd....