This chapter describes the elements discovered and managed by the Multicast Manager, their relationships, and their attributes. Object classes in the Multicast ManagerThe Multicast Manager builds a data model of the discovered multicast elements in its domain. The model represents the multicast elements, their relationships, and their connections. Multicast RelationshipsDuring discovery and post-processing phases, the Multicast Manager creates the relationships and connections between the multicast elements. For every relationship or connection, there is an inverse relationship or connection. For example, the relationship PartOf is the inverse relationship of ComposedOf. Multicast treesThis section describes how multicast distribution trees are modeled in the Multicast Manager. Rendezvous points and designated routersThe following MulticastServices have additional relationships in the Multicast Manager repository: MSDP and redundancy groupsMSDP serves two purposes in multicast networks: