The L3 VPN Service model (L3SM) is aimed at being used between the entity that interacts directly with the customer (service orchestrator) and the entity in charge of network orchestration and control.
The L3SM model defined in RFC 8299 [RFC8299] is extended it to facilitate communication between the service orchestrator and transport orchestrator (MSDC), and an MDSC and domain controllers. The resulting model is called the L3VPN Network Model (L3NM).