| Device Online Help |
Source Specific Multicast (SSM) optimizes PIM-SM by simplifying the many-to-many model (servers-to-receivers). Since most multicast applications distribute content to a group in one direction, SSM uses a one-to-many model that only uses a subset of the PIM-SM features. This model is more efficient and puts less of a load on multicast routing devices.
For more information about SSM concepts and terminology, refer to Configuring IP Multicast Routing Protocols.