Network Service Header (NSH) Context Header Allocation: Timestamp
draft-mymb-sfc-nsh-allocation-timestamp-00

Document Type Active Internet-Draft (individual)
Last updated 2017-01-12
Stream (None)
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                         T. Mizrahi
Internet-Draft                                             I. Yerushalmi
Intended status: Informational                                 D. Melman
Expires: July 16, 2017                                           Marvell
                                                               R. Browne
                                                                   Intel
                                                        January 12, 2017

   Network Service Header (NSH) Context Header Allocation: Timestamp
               draft-mymb-sfc-nsh-allocation-timestamp-00

Abstract

   This memo defines an allocation for the Context Headers of the
   Network Service Header (NSH), which incorporates the packet's ingress
   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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 16, 2017.

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
   (http://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

Mizrahi, et al.           Expires July 16, 2017                 [Page 1]
Internet-Draft            NSH Ingress Timestamp             January 2017

   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.  Ingress Timestamping Use Cases  . . . . . . . . . . . . . . .   4
     4.1.  Network Analytics . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Alternate Marking . . . . . . . . . . . . . . . . . . . .   5
     4.3.  Consistent Updates  . . . . . . . . . . . . . . . . . . .   5
   5.  Synchronization Considerations  . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

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 ingress 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 ingress timestamp is measured by the Classifier
   [RFC7665], and incorporated in the NSH.  The ingress 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
Show full document text