Network Service Header (NSH)
draft-ietf-sfc-nsh-16

Document Type Active Internet-Draft (sfc WG)
Last updated 2017-07-19
Replaces draft-quinn-sfc-nsh
Stream IETF
Intended RFC status Proposed Standard
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Service Function Chaining                                  P. Quinn, Ed.
Internet-Draft                                                     Cisco
Intended status: Standards Track                           U. Elzur, Ed.
Expires: January 20, 2018                                          Intel
                                                       C. Pignataro, Ed.
                                                                   Cisco
                                                           July 19, 2017

                      Network Service Header (NSH)
                         draft-ietf-sfc-nsh-16

Abstract

   This document describes a Network Service Header (NSH) inserted onto
   packets or frames to realize service function paths.  NSH also
   provides a mechanism for metadata exchange along the instantiated
   service paths.  NSH is the SFC encapsulation required to support the
   Service Function Chaining (SFC) architecture (defined in RFC7665).

Status of This Memo

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

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   This Internet-Draft will expire on January 20, 2018.

Copyright Notice

   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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Quinn, et al.           Expires January 20, 2018                [Page 1]
Internet-Draft        Network Service Header (NSH)             July 2017

   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Definition of Terms . . . . . . . . . . . . . . . . . . .   4
     1.3.  Problem Space . . . . . . . . . . . . . . . . . . . . . .   4
     1.4.  NSH-based Service Chaining  . . . . . . . . . . . . . . .   5
   2.  Network Service Header  . . . . . . . . . . . . . . . . . . .   5
     2.1.  Network Service Header Format . . . . . . . . . . . . . .   6
     2.2.  NSH Base Header . . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Service Path Header . . . . . . . . . . . . . . . . . . .   9
     2.4.  NSH MD Type 1 . . . . . . . . . . . . . . . . . . . . . .  10
     2.5.  NSH MD Type 2 . . . . . . . . . . . . . . . . . . . . . .  11
       2.5.1.  Optional Variable Length Metadata . . . . . . . . . .  11
   3.  NSH Actions . . . . . . . . . . . . . . . . . . . . . . . . .  13
   4.  NSH Transport Encapsulation . . . . . . . . . . . . . . . . .  14
   5.  Fragmentation Considerations  . . . . . . . . . . . . . . . .  15
   6.  Service Path Forwarding with NSH  . . . . . . . . . . . . . .  15
     6.1.  SFFs and Overlay Selection  . . . . . . . . . . . . . . .  15
     6.2.  Mapping NSH to Network Transport  . . . . . . . . . . . .  18
     6.3.  Service Plane Visibility  . . . . . . . . . . . . . . . .  19
     6.4.  Service Graphs  . . . . . . . . . . . . . . . . . . . . .  19
   7.  Policy Enforcement with NSH . . . . . . . . . . . . . . . . .  19
     7.1.  NSH Metadata and Policy Enforcement . . . . . . . . . . .  19
     7.2.  Updating/Augmenting Metadata  . . . . . . . . . . . . . .  21
     7.3.  Service Path Identifier and Metadata  . . . . . . . . . .  23
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  24
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  26
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  27
     11.1.  NSH EtherType  . . . . . . . . . . . . . . . . . . . . .  27
     11.2.  Network Service Header (NSH) Parameters  . . . . . . . .  27
       11.2.1.  NSH Base Header Unassigned Bits  . . . . . . . . . .  27
       11.2.2.  NSH Version  . . . . . . . . . . . . . . . . . . . .  27
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