Network Service Header (NSH)
RFC 8300

Document Type RFC - Proposed Standard (January 2018; No errata)
Last updated 2018-01-12
Replaces draft-quinn-sfc-nsh
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Joel Halpern
Shepherd write-up Show (last changed 2017-07-26)
IESG IESG state RFC 8300 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alia Atlas
Send notices to "Joel M. Halpern" <jmh@joelhalpern.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                     P. Quinn, Ed.
Request for Comments: 8300                                         Cisco
Category: Standards Track                                  U. Elzur, Ed.
ISSN: 2070-1721                                                    Intel
                                                       C. Pignataro, Ed.
                                                                   Cisco
                                                            January 2018

                      Network Service Header (NSH)

Abstract

   This document describes a Network Service Header (NSH) imposed on
   packets or frames to realize Service Function Paths (SFPs).  The NSH
   also provides a mechanism for metadata exchange along the
   instantiated service paths.  The NSH is the Service Function Chaining
   (SFC) encapsulation required to support the SFC architecture (defined
   in RFC 7665).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8300.

Copyright Notice

   Copyright (c) 2018 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
   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.

Quinn, et al.                Standards Track                    [Page 1]
RFC 8300              Network Service Header (NSH)          January 2018

Table of Contents

   1. Introduction ....................................................3
      1.1. Applicability ..............................................4
      1.2. Requirements Language ......................................4
      1.3. Definition of Terms ........................................4
      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 .............................................13
           2.5.1. Optional Variable-Length Metadata ..................13
   3. NSH Actions ....................................................15
   4. NSH Transport Encapsulation ....................................16
   5. Fragmentation Considerations ...................................17
   6. Service Path Forwarding with NSH ...............................18
      6.1. SFFs and Overlay Selection ................................18
      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. IANA Considerations ............................................32
      9.1. NSH Parameters ............................................32
           9.1.1. NSH Base Header Bits ...............................32
           9.1.2. NSH Version ........................................32
           9.1.3. NSH MD Types .......................................33
           9.1.4. NSH MD Class .......................................33
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