Network Service Header (NSH) Context Header Allocation: Timestamp
draft-mymb-sfc-nsh-allocation-timestamp-02

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Last updated 2017-08-20
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Network Working Group                                         T. Mizrahi
Internet-Draft                                             I. Yerushalmi
Intended status: Informational                                 D. Melman
Expires: February 21, 2018                                       Marvell
                                                               R. Browne
                                                                   Intel
                                                         August 20, 2017

   Network Service Header (NSH) Context Header Allocation: Timestamp
               draft-mymb-sfc-nsh-allocation-timestamp-02

Abstract

   This memo defines an allocation for the Context Headers of the
   Network Service Header (NSH), which incorporates the packet's
   timestamp, a sequence number, and a source interface identifier.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 21, 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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   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.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   3
   3.  NSH Context Header Allocation Allocation  . . . . . . . . . .   3
   4.  Timestamping Use Cases  . . . . . . . . . . . . . . . . . . .   5
     4.1.  Network Analytics . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Alternate Marking . . . . . . . . . . . . . . . . . . . .   6
     4.3.  Consistent Updates  . . . . . . . . . . . . . . . . . . .   6
   5.  Synchronization Considerations  . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The Network Service Header (NSH), defined in [I-D.ietf-sfc-nsh], is
   an encapsulation header that is used in Service Function Chains
   (SFC).

   The NSH specification [I-D.ietf-sfc-nsh] supports two possible
   methods of including metadata in the NSH; MD Type 0x1 and MD Type
   0x2.  When using MD Type 0x1 the NSH includes 16 octets of Context
   Header fields.  The current memo proposes an allocation for the MD
   Type 0x1 Context Headers, which incorporates the timestamp of the
   packet, a sequence number, and a source interface identifier.

   In a nutshell, packets that enter the SFC-Enabled Domain are
   timestamped.  The timestamp is measured by the Classifier [RFC7665],
   and incorporated in the NSH.  The timestamp may be used for various
   different purposes, including delay measurement, packet marking for
   passive performance monitoring, and timestamp-based policies.
   Notably, the timestamp does not increase the packet length, since it
   is incorporated in the MD Type 0x1 Mandatory Context Headers.

   The source interface identifier indicates the interface through which
   the packet was received at the classifier.  This identifer may
   specify a physical or a virtual interface.  The sequence numbers can
   be used by Service Functions (SFs) to detect out-of-order delivery or

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