Description: This object describes the replication of IP Multicast sessions onto the different Downstream Channel Sets of a CMTS. Each DCS may be either a single downstream channel or a bonding group of multiple downstream channels. Each IP Multicast session is identified by a combination of IP source and IP Destination group address '(S,G). The CMTS replicates each IP packet in an (S,G) session onto one or more Downstream Channel Sets (DCSs), each of which is implemented in a MAC Domain. The CMTS assigns each replication a Downstream Service ID (DSID) that is unique per MAC Domain.