Network Service Header Metadata Type 2 Variable-Length Context Headers
draft-ietf-sfc-nsh-tlv-03

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SFC                                                          Y. Wei, Ed.
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                                U. Elzur
Expires: November 21, 2020                                         Intel
                                                                S. Majee
                                                       Caber systems inc
                                                            May 20, 2020

 Network Service Header Metadata Type 2 Variable-Length Context Headers
                       draft-ietf-sfc-nsh-tlv-03

Abstract

   This draft describes Network Service Header (NSH) Metadata (MD) Type
   2 variable-length context headers that can be used within a service
   function path.

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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   This Internet-Draft will expire on November 21, 2020.

Copyright Notice

   Copyright (c) 2020 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  NSH MD Type 2 format  . . . . . . . . . . . . . . . . . . . .   3
   4.  NSH MD Type 2 Context Headers . . . . . . . . . . . . . . . .   4
     4.1.  Forwarding Context  . . . . . . . . . . . . . . . . . . .   4
     4.2.  Tenant Identifier . . . . . . . . . . . . . . . . . . . .   5
     4.3.  Content Type  . . . . . . . . . . . . . . . . . . . . . .   5
     4.4.  Ingress Network Node Information  . . . . . . . . . . . .   6
     4.5.  Ingress Network Source Interface  . . . . . . . . . . . .   6
     4.6.  Flow ID . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.7.  Source and/or Destination Groups  . . . . . . . . . . . .   7
     4.8.  Universal Resource Identifier . . . . . . . . . . . . . .   7
     4.9.  Policy Identifier (POLICY_ID) . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Forwarding Context Types  . . . . . . . . . . . . . . . .   9
     7.2.  Tenant Identifier Types . . . . . . . . . . . . . . . . .   9
     7.3.  Group Types . . . . . . . . . . . . . . . . . . . . . . .  10
     7.4.  URI Types . . . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Network Service Header (NSH) [RFC8300] is the Service Function
   Chaining (SFC) encapsulation required to support the SFC
   architecture.  As such, NSH provides following key elements:

   1.  Service Function Path identification.

   2.  Indication of location within a Service Function Path.

   3.  Optional, per-packet metadata (fixed-length or variable).

   [RFC8300] further defines two metadata formats (MD Types): 1 and 2.
   MD Type 1 defines fixed length, 16 bytes-long metadata, whereas MD
   Type 2 defines a variable-length context format for metadata.  This

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