Network Service Header (NSH)
draft-ietf-sfc-nsh-28

Document Type Active Internet-Draft (sfc WG)
Last updated 2017-11-13 (latest revision 2017-11-03)
Replaces draft-quinn-sfc-nsh
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IANA IANA review state Version Changed - Review Needed
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RFC Editor RFC Editor state EDIT
Service Function Chaining                                  P. Quinn, Ed.
Internet-Draft                                                     Cisco
Intended status: Standards Track                           U. Elzur, Ed.
Expires: May 7, 2018                                               Intel
                                                       C. Pignataro, Ed.
                                                                   Cisco
                                                        November 3, 2017

                      Network Service Header (NSH)
                         draft-ietf-sfc-nsh-28

Abstract

   This document describes a Network Service Header (NSH) imposed on
   packets or frames to realize service function paths.  The NSH also
   provides a mechanism for metadata exchange along the instantiated
   service paths.  The 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.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on May 7, 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Quinn, et al.              Expires May 7, 2018                  [Page 1]
Internet-Draft        Network Service Header (NSH)         November 2017

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.2.  Applicability . . . . . . . . . . . . . . . . . . . . . .   4
     1.3.  Definition of Terms . . . . . . . . . . . . . . . . . . .   5
     1.4.  Problem Space . . . . . . . . . . . . . . . . . . . . . .   6
     1.5.  NSH-based Service Chaining  . . . . . . . . . . . . . . .   6
   2.  Network Service Header  . . . . . . . . . . . . . . . . . . .   7
     2.1.  Network Service Header Format . . . . . . . . . . . . . .   7
     2.2.  NSH Base Header . . . . . . . . . . . . . . . . . . . . .   8
     2.3.  Service Path Header . . . . . . . . . . . . . . . . . . .  11
     2.4.  NSH MD Type 1 . . . . . . . . . . . . . . . . . . . . . .  12
     2.5.  NSH MD Type 2 . . . . . . . . . . . . . . . . . . . . . .  12
       2.5.1.  Optional Variable Length Metadata . . . . . . . . . .  13
   3.  NSH Actions . . . . . . . . . . . . . . . . . . . . . . . . .  14
   4.  NSH Transport Encapsulation . . . . . . . . . . . . . . . . .  16
   5.  Fragmentation Considerations  . . . . . . . . . . . . . . . .  17
   6.  Service Path Forwarding with NSH  . . . . . . . . . . . . . .  17
     6.1.  SFFs and Overlay Selection  . . . . . . . . . . . . . . .  17
     6.2.  Mapping the NSH to Network Topology . . . . . . . . . . .  21
     6.3.  Service Plane Visibility  . . . . . . . . . . . . . . . .  21
     6.4.  Service Graphs  . . . . . . . . . . . . . . . . . . . . .  22
   7.  Policy Enforcement with NSH . . . . . . . . . . . . . . . . .  22
     7.1.  NSH Metadata and Policy Enforcement . . . . . . . . . . .  22
     7.2.  Updating/Augmenting Metadata  . . . . . . . . . . . . . .  24
     7.3.  Service Path Identifier and Metadata  . . . . . . . . . .  25
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
     8.1.  NSH Security Considerations from Operators' Environments   27
     8.2.  NSH Security Considerations from the SFC Architecture . .  28
       8.2.1.  Integrity . . . . . . . . . . . . . . . . . . . . . .  29
       8.2.2.  Confidentiality . . . . . . . . . . . . . . . . . . .  31
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  32
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  33
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