This document specifies the open system interconnections (OSI) application layer, the transport, and the network layer, as well as the mapping to the controller area network (CAN) data link layer protocol as specified in ISO 11898-1. The application layer specifies messages, which are mapped to CAN CC data frames using the classic extended frame format (CEFF). For messages exceeding the length of the CEFF-formatted data frames, this document specifies transport layer and network layer protocols based on the SAE J1939-21 recommended practice.