Service Function Chaining: Subscriber and Performance Policy Identification Variable-Length Network Service Header (NSH) Context Headers
draft-ietf-sfc-serviceid-header-04

Document Type Active Internet-Draft (sfc WG)
Last updated 2019-10-30
Replaces draft-sfc-serviceid-header
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SFC                                                          B. Sarikaya
Internet-Draft                                       Denpel Informatique
Intended status: Standards Track                             D. von Hugo
Expires: May 2, 2020                                    Deutsche Telekom
                                                            M. Boucadair
                                                                  Orange
                                                        October 30, 2019

      Service Function Chaining: Subscriber and Performance Policy
  Identification Variable-Length Network Service Header (NSH) Context
                                Headers
                   draft-ietf-sfc-serviceid-header-04

Abstract

   This document defines Subscriber and Performance Policy Identifiers
   Network Service Header Variable-Length Context Headers to inform
   Service Functions about subscriber- and service-related information
   for the sake of policy enforcement and appropriate service function
   chaining operations.  The structure of each context header is
   defined, their use and processing instructions by SFC-aware nodes are
   explained.

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 https://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 May 2, 2020.

Copyright Notice

   Copyright (c) 2019 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

Sarikaya, et al.           Expires May 2, 2020                  [Page 1]
Internet-Draft   NSH Subscriber/Performance Policy TLVs     October 2019

   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
   3.  Subscriber Identification NSH Variable-Length Context Header    4
   4.  Performance Policy Identification NSH Variable-Length Context
       Headers . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   This document discusses how to inform Service Functions (SFs,
   [RFC7665]) about subscriber- and service-related information, when
   required, for the sake of policy enforcement within a single
   administrative domain.  Particularly, subscriber-related information
   may be required to enforce subscriber-specific SFC-based traffic
   policies.  Nevertheless, the information carried in packets may not
   be sufficient to unambiguously identify a subscriber.  This document
   fills this void by specifying a new Network Service Header (NSH)
   [RFC8300] context header to convey and disseminate such information
   within the boundaries of a single administrative domain.

   Also, the enforcement of SFC-based differentiated traffic policies
   may be inferred, for example, by QoS (Quality of Service)
   considerations.  Typically, QoS information may serve as an input to
   the Service Function Path (SFP) for path computation, establishment,
   and selection.  Furthermore, the dynamic structuring of service
   function chains and their subsequent enforcement may be conditioned
   by QoS requirements that will affect SF instance identification,
   location, and sequencing.  Hence, the need to supply a performance
   policy identifier to upstream SFs to appropriately meet the service
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