CONTENTS

 1     Scope and field of application
 2     References
        2.1     Normative references
 3     Terms and definitions
        3.1     Network-based Virtual Private Network (NB VPN)
        3.2     NB Layer 1 VPN
                  3.2.1     Optical VPN
        3.3     NB Layer 2 VPN
        3.4     NB Layer 3 VPN
                  3.4.1     NB IP VPN
        3.5     Virtual Services Network (VSN)
        3.6     Virtual Transport Network
 4     Abbreviations and Acronyms
 5     Service definition
        5.1     Introduction
                  5.1.1     Types of VPN service
                  5.1.2     NB  VPN service view
                  5.1.3     NB  VPN service deployment scenarios
        5.2     NB VPN service reference model
                  5.2.1     Designation of VPN network elements
                  5.2.2     Auto-discovery among network elements
 6     Abstract framework of NB VPN
        6.1     Operational environment
        6.2     VSN/VTN overview
                  6.2.1     General model
                  6.2.2     VSN and VTN components
        6.3     VPN management
 7     Service requirements
        7.1     Service requirements for virtual services network
                  7.1.1     General VSN service requirements
                  7.1.2     Configuration management
                  7.1.3     Fault management
                  7.1.4     Performance management
                  7.1.5     Accounting
                  7.1.6     Security
                  7.1.7     Service Level Agreements and QoS
        7.2     Service requirements for virtual transport network
                  7.2.1     General service provision
                  7.2.2     Configuration management
                  7.2.3     Fault management
                  7.2.4     Performance management
                  7.2.5     Accounting
                  7.2.6     Security
Appendix I – Service deployment scenarios for NB IP VPN
Introduction
        I.1        Intranet (connectivity between sites in the same organization)
        I.2        Extranet (connectivity between sites across multiple organizations)
        I.3        VPNs across multiple autonomous systems or service providers
        I.4        Simultaneous VPN and Internet access
        I.5        Hierarchical VPNs  (VPNs within VPNs)
        I.6        Multiple Access Scenarios  (Dial, DSL, fixed wireless, cable)
Appendix II – Service deployment scenarios for NB Layer 2 VPN
Appendix III – Service deployment scenarios for NB Layer 1 VPN
Appendix IV – Examples of practical realizations of VTN approaches for NB IP VPN