Virtual Transport Network (VTN) Scalability Considerations for Enhanced VPN
draft-dong-teas-enhanced-vpn-vtn-scalability-00

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TEAS working group                                            J. Dong 
Internet-Draft                                                  Z. Li 
Intended status: Standard Track                                Huawei 
Expires: August 2020                                           F. Qin 
                                                         China Mobile 
                                                    February 10, 2020               
                                                                      
                                      
     Virtual Transport Network (VTN) Scalability Considerations for 
                               Enhanced VPN 
                                      
            draft-dong-teas-enhanced-vpn-vtn-scalability-00 

Abstract 

   Enhanced VPN (VPN+) is an enhancement to VPN services to support the 
   needs of new applications, particularly including the applications 
   that are associated with 5G services.  An enhanced VPN could be used 
   for transport network slicing in 5G, and will also be of use in more 
   generic scenarios.  I-D.ietf-teas-enhanced-vpn describes the 
   framework and candidate component technologies for providing 
   enhanced VPN services.  This document describes the scalability 
   considerations in the control plane and data plane to enable VPN+ 
   services, some optimization mechanisms are also described.  

Status of This Memo 

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   This Internet-Draft will expire on August 10, 2020. 

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   Copyright (c) 2020 IETF Trust and the persons identified as the 
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Dong, et al.           Expires August 10, 2020                [Page 1] 


Internet-Draft     VPN+ Scalability Considerations       February 2020 
    

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Table of Contents 

    
   1. Introduction ................................................ 2 
   2. Requirements Language........................................ 3 
   3. Scalability Requirement ..................................... 3 
   4. Scalability Considerations .................................. 5 
      4.1. Control Plane Scalability Considerations ............... 5 
      4.1.1. Distributed Control Plane ............................ 5 
      4.1.2. Centralized Control Plane ............................ 6 
      4.2. Data Plane Scalability Considerations .................. 6 
      4.3. Gap Analysis of Existing Mechanism ..................... 7 
   5. Possible Optimization ....................................... 7 
      5.1. Control Plane Optimization ............................. 7 
      5.2. Data Plane Optimization ................................ 9 
   6. Solution Evolution for Improved Scalability ................ 11 
   7. Security Considerations .................................... 11 
   IANA Considerations ........................................... 11 
   Acknowledgments ............................................... 11 
   References .................................................... 12 
      Normative References........................................ 12 
      Informative References ..................................... 12 
   Authors' Addresses ............................................ 13 
    
1. Introduction 

   Virtual private networks (VPNs) have served the industry well as a 
   means of providing different groups of users with logically isolated 
   connectivity over a common network. The VPN service is provided with 
   two network layers: the overlay and the underlay.  The underlay is 
   responsible for establishing the network connectivity and managing 
   network resources to meet the service requirement.  The overlay is 
   used to distribute the membership and reachability information of 
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