UDP Transport for Network Service Header
draft-kumar-sfc-nsh-udp-transport-03

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Last updated 2017-02-22
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Service Function Chaining                                  S. Kumar, Ed.
Internet-Draft                                           L. Kreeger, Ed.
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: August 26, 2017                                        S. Majee
                                                             F5 Networks
                                                             W. Haeffner
                                                                Vodafone
                                                                R. Manur
                                                                Broadcom
                                                               D. Melman
                                                                 Marvell
                                                       February 22, 2017

                UDP Transport for Network Service Header
                  draft-kumar-sfc-nsh-udp-transport-03

Abstract

   This draft describes the transport encapsulation to carry Network
   Service Header (NSH) over UDP transport protocol.  This enables
   applications and services using NSH to communicate over a simple
   layer-3 network without topological constraints.  It brings down the
   barrier to deploy NSH by not requiring additional overhead as is
   typical of overlay encapsulation mechanisms designed on top of UDP.

   As a first benefit, this method eases the deployment of Service
   Function Chaining (SFC) by allowing SFC components to utilize the
   basic UDP/IP stack available in virtually all network elements and
   end systems to setup the virtual network and realize Service Function
   Chains (SFCs).

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 26, 2017.

Kumar, et al.            Expires August 26, 2017                [Page 1]
Internet-Draft              NSH UDP Transport              February 2017

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   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Applicability and Operating Environments  . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Definition Of Terms . . . . . . . . . . . . . . . . . . . . .   4
   3.  NSH UDP Overlay Transport Encapsulation . . . . . . . . . . .   5
     3.1.  Stacking And Layering . . . . . . . . . . . . . . . . . .   5
     3.2.  NSH UDP Overlay Packet Format . . . . . . . . . . . . . .   5
   4.  UDP Encapsulation Considerations  . . . . . . . . . . . . . .   7
     4.1.  UDP Transport End-points  . . . . . . . . . . . . . . . .   7
     4.2.  UDP Source Port Considerations  . . . . . . . . . . . . .   7
     4.3.  Checksum Considerations . . . . . . . . . . . . . . . . .   8
       4.3.1.  IPv4 Checksum Processing  . . . . . . . . . . . . . .   8
       4.3.2.  IPv6 Checksum Processing  . . . . . . . . . . . . . .   8
       4.3.3.  UDP-Lite Considerations . . . . . . . . . . . . . . .  10
     4.4.  Congestion Considerations . . . . . . . . . . . . . . . .  10
     4.5.  MTU and Fragmentation Considerations  . . . . . . . . . .  11
     4.6.  Middlebox Considerations  . . . . . . . . . . . . . . . .  12
     4.7.  Differentiated Services and ECN Considerations  . . . . .  12
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
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