Encapsulating IPsec ESP in UDP for Load-balancing
draft-xu-ipsecme-esp-in-udp-lb-01

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Last updated 2017-11-24
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Network Working Group                                              X. Xu
Internet-Draft                                                  D. Zhang
Intended status: Standards Track                                  L. Xia
Expires: May 28, 2018                                             Huawei
                                                       November 24, 2017

           Encapsulating IPsec ESP in UDP for Load-balancing
                   draft-xu-ipsecme-esp-in-udp-lb-01

Abstract

   IPsec Virtual Private Network (VPN) is widely used by enterprises to
   interconnect their geographical dispersed branch office locations
   across IP Wide Area Network (WAN) or the Internet, especially in the
   Software-Defined-WAN (SD-WAN) era.  To fully utilize the bandwidth
   available in IP WAN or the Internet, load balancing of traffic
   between different IPsec VPN sites over Equal Cost Multi-Path (ECMP)
   and/or Link Aggregation Group (LAG) is attractive to those
   enterprises deploying IPsec VPN solutions.  This document defines a
   method to encapsulate IPsec Encapsulating Security Payload (ESP)
   packets over UDP tunnels for improving load-balancing of IPsec ESP
   traffic.

Status of This Memo

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   This Internet-Draft will expire on May 28, 2018.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Xu, et al.                Expires May 28, 2018                  [Page 1]
Internet-Draft Encapsulating ESP in UDP for Load-balancing November 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Encapsulation in UDP  . . . . . . . . . . . . . . . . . . . .   3
   4.  Processing Procedures . . . . . . . . . . . . . . . . . . . .   5
   5.  Congestion Considerations . . . . . . . . . . . . . . . . . .   5
   6.  Applicability Statements  . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   IPsec Virtual Private Network (VPN) is widely used by enterprises to
   interconnect their geographical dispersed branch office locations
   across IP Wide Area Network (WAN) or the Internet, especially in the
   Software-Defined-WAN (SD-WAN) era.  To fully utilize the bandwidth
   available in IP WAN or the Internet, load balancing of traffic
   between different IPsec VPN sites over Equal Cost Multi-Path (ECMP)
   and/or Link Aggregation Group (LAG) is much attractive to those
   enterprises that deploy IPsec VPN solutions.  Since most existing
   core routers within IP WAN or the Internet can already support
   balancing IP traffic flows based on the hash of the five-tuple of UDP
   packets, by encapsulating IPsec Encapsulating Security Payload (ESP)
   packets over UDP tunnels with the UDP source port being used as an
   entropy field, it will enable existing core routers to perform
   efficient load-balancing of the IPsec ESP traffic without requiring
   any change to them.  Therefore, this specification defines a method
   of encapsulating IPsec ESP packets over UDP tunnels for improving
   load-balancing of IPsec ESP traffic.

   Encapsulating ESP in UDP, as defined in this document, can be used in
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