Operate and maintain
Documents under this category provide functional descriptions and procedures for configuring, operating, and maintaining the cMAG-c.
- Control Plane Function
  This guide describes the control plane function (CPF) for control and user plane separation (CUPS) solutions. The CPF is based on the packet forwarding control protocol (PFCP) interface as defined in 3GPP TS 29.244 for mobile 4G CUPS and 5G.
  - Getting started
    Find general information about this guide.
  - cMAG-c configuration quick start
    The quick start steps configure the main components required to prepare the cMAG-c for subscriber management.
  - Session management
    Get a general overview of the session functionality and the address assignment protocols, and details on the IPoE and PPPoE fixed access session types.
    - PFCP session
    - General session functionality
      Get a high-level overview of the PFCP protocol and general session related functionality including grouping sessions for a subscriber, QoS, service selection, session state, and lawful intercept.
    - Lawful intercept
      The lawful intercept (LI) solution is implemented on the cMAG-c and on the user plane (UP). The cMAG-c and the UP share a private key to allow decryption of LI PFCP IEs. This topic describes the LI implementation, the content of LI notifications, and how to configure LI on the cMAG-c.
    - Fixed access sessions
      Learn about the key identifiers for fixed access sessions, IBCP tunnels, MAG-u selection, limits on the number of sessions, and the IPoE setup flows.
    - Address assignment protocols
      A cMAG-c solution supports various address assignment protocols per session type.
  - Address assignment
    The cMAG-c supports various address assignment options, including local address assignment via ODSA, local static address assignment via authentication database, AAA-based address assignment, non-provisioned address assignment, and external DHCPv4 and DHCPv6 server address assignment.
  - Authentication
    Configure authentication for a new cMAG-c session, including the RADIUS authentication profile. Learn about the BNG EP and ADB lookup process.
  - Accounting and charging
    Learn about the statistics collection from the MAG-u, time-based and volume-based charging, RADIUS accounting configuration, and buffering of the RADIUS accounting messages for later retransmission.
  - Python support
    Customize the cMAG-c behavior by applying user-defined Python scripts to inspect and modify control protocol packets.
  - MAG-u resiliency
    The Nokia cMAG-c supports a cMAG-c-driven MAG-u resiliency scheme. Learn about this resiliency scheme, the resiliency handling, and deployment use cases.
  - cMAG-c management
    The cMAG-c management features are built on top of SR Linux management with some exceptions and differences from SR Linux.
  - Control Plane Function Guide PDF
- SR OS User Plane Function

Session management

Get a general overview of the session functionality and the address assignment protocols, and details on the IPoE and PPPoE fixed access session types.

July 11, 2025