Control Plane and User Plane Separated BNG Deployment Model
draft-cuspdt-rtgwg-cu-separation-bng-deployment-02

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INTERNET-DRAFT                                                     R. Gu
Intended status: Informational                                     S. Hu
                                                            China Mobile
                                                                 M. Wang
                                                             D. Eastlake
                                                                  Huawei
                                                                   F. Hu
                                                                     ZTE
Expires: June 11, 2019                                 December 12, 2018

      Control Plane and User Plane Separated BNG Deployment Model
           draft-cuspdt-rtgwg-cu-separation-bng-deployment-02

Abstract

   This document describes the deployment model for a Broadband Network
   Gateway (BNG) device with Control Plane (CP) and User Plane(UP)
   separation. It is intended to give guidance for the deployment of CP
   and UP separated BNG devices in an operators' network.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the authors or the BESS working group mailing list: bess@ietf.org.

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Gu, et al.                                                      [Page 1]
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INTERNET-DRAFT                            Separated BNG Deployment Model

Table of Contents

      1. Introduction and Overview...............................3

      2. Concept and Terminology.................................5
      2.1 Terminology............................................5

      3. BNG with CP and UP Separation Deployment Model..........6
      3.1 CP and UP of BNG Deployment Within One District........6
      3.2. CP and UP of BNG Deployment in Multiple Districts.....7

      4. The Process of BNG with CUPS in Home Service...........10

      5. High Availability Considerations.......................11

      6. Security Considerations................................12
      7. IANA Considerations....................................12

      Normative References......................................13
      Informative References....................................13

      Authors' Addresses........................................14
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Gu, et al.                                                      [Page 2]
INTERNET-DRAFT                            Separated BNG Deployment Model

1. Introduction and Overview

   A Broadband Network Gateway (BNG) is an Ethernet-centric IP edge
   router and acts as the aggregation point for the user traffic with
   some additional functions such as address management and cooperating
   with AAA (Radius/Diameter) systems and subscriber management. Because
   of the rapid development of new services, such as 4K, IoT, etc. and
   the increasing numbers of distributed home broadband service users,
   high resource utilization, high-efficiency management, and fast
   service provisioning are required. This calls for a new BNG
   architecture with CP and UP separation, which is also called Cloud
   BNG, as proposed in [BBF-CloudCO] [TR-384].

   The CP and UP separation architecture of the BNG is composed of a
   Control Plane and a User Plane, with the concentrated CP responsible
   for control and management of the UP's resources and subscribers'
   information, and with the distributed UP taking charge of policy
   implementation and traffic forwarding. The obvious advantages of this
   new architecture are listed below.

   Resource Utilization Improvement: A centralized Control Plane
             provides unified management capability for network
             resources and users information. The CP has an overview of
             all the resources and can distribute resources as specific
             users require, thus resources can be totally controlled and
             balanced.

   Management with High Efficiency: A centralized CP provides a unified
             management interface to the outside systems such as EMS,
             DHCP Server, AAA Server, etc. In this situation, management
             can be easier for the centralized CP as it's the only
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