Network Service Header TLVs
draft-quinn-sfc-nsh-tlv-02

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Last updated 2016-10-21
Replaces draft-quinn-nsh-tlv
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Network Working Group                                           P. Quinn
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                                U. Elzur
Expires: April 24, 2017                                            Intel
                                                                S. Majee
                                                                      F5
                                                              J. Halpern
                                                                Ericsson
                                                        October 21, 2016

                      Network Service Header TLVs
                     draft-quinn-sfc-nsh-tlv-02.txt

Abstract

   This draft describes Network Service Header (NSH) MD-Type 2 metadata
   TLVs that can be used within a service function path.

Status of this Memo

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   This Internet-Draft will expire on April 24, 2017.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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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 . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  NSH Type 2 Format  . . . . . . . . . . . . . . . . . . . . . .  4
   3.  NSH Type 2 TLVs  . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   5.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 12
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 13
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15

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1.  Introduction

   Network Service Header [NSH] is the SFC encapsulation protocol used
   to create Service Function Chains.  As such, NSH provides two key
   elements:

   1.  Service Function Path identification

   2.  Metadata

   NSH further defines two metadata formats (MD Types): 1 and 2.  MD
   Type 1 defines fixed length, 16 byte metadata, whereas MD Type 2
   defines a variable-length TLV format for metadata.  This draft
   defines some common TLVs for use with NSH MD Type 2.

   This draft does not address metadata usage, updating/chaining of
   metadata or other SFP functions.  Those topics are described in NSH.

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2.  NSH Type 2 Format

   A NSH is composed of a 4-byte Base Header, a 4-byte Service Path
   Header and Context Headers.  The Base Header identifies the MD-Type
   in use:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Ver|O|C|R|R|R|R|R|R|   Length  |    MD Type    | Next Protocol |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                         Figure 1: NSH Base Header

   Please refer to NSH [NSH] for a detailed header description.
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