Hierarchical Service Function Chaining (hSFC)
draft-ietf-sfc-hierarchical-07

Document Type Active Internet-Draft (sfc WG)
Last updated 2018-04-10 (latest revision 2018-02-18)
Replaces draft-dolson-sfc-hierarchical
Stream IETF
Intended RFC status Informational
Formats plain text xml pdf html bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Behcet Sarikaya
Shepherd write-up Show (last changed 2018-02-20)
IESG IESG state AD Evaluation
Consensus Boilerplate Unknown
Telechat date
Responsible AD Martin Vigoureux
Send notices to Behcet Sarikaya <sarikaya@ieee.org>
Service Function Chaining                                      D. Dolson
Internet-Draft
Intended status: Informational                                  S. Homma
Expires: August 22, 2018                                             NTT
                                                                D. Lopez
                                                          Telefonica I+D
                                                            M. Boucadair
                                                                  Orange
                                                              2 18, 2018

             Hierarchical Service Function Chaining (hSFC)
                     draft-ietf-sfc-hierarchical-07

Abstract

   Hierarchical Service Function Chaining (hSFC) is a network
   architecture allowing an organization to decompose a large-scale
   network into multiple domains of administration.

   The goals of hSFC are to make a large-scale network easier to reason
   about, simpler to control and to support independent functional
   groups within large network operators.

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 https://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 August 22, 2018.

Copyright Notice

   Copyright (c) 2018 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

Dolson, et al.           Expires August 22, 2018                [Page 1]
Internet-Draft                    hSFC                            2 2018

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Hierarchical Service Function Chaining (hSFC) . . . . . . . .   4
     2.1.  Top Level . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Lower Levels  . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Internal Boundary Node (IBN)  . . . . . . . . . . . . . . . .   8
     3.1.  IBN Path Configuration  . . . . . . . . . . . . . . . . .   8
       3.1.1.  Flow-Stateful IBN . . . . . . . . . . . . . . . . . .   9
       3.1.2.  Encoding Upper-Level Paths in Metadata  . . . . . . .  10
       3.1.3.  Using Unique Paths per Upper-Level Path . . . . . . .  11
       3.1.4.  Nesting Upper-Level NSH within Lower-Level NSH  . . .  11
       3.1.5.  Stateful/Metadata Hybrid  . . . . . . . . . . . . . .  12
     3.2.  Gluing Levels Together  . . . . . . . . . . . . . . . . .  14
     3.3.  Decrementing Service Index  . . . . . . . . . . . . . . .  14
     3.4.  Managing TTL  . . . . . . . . . . . . . . . . . . . . . .  14
   4.  Sub-domain Classifier . . . . . . . . . . . . . . . . . . . .  15
   5.  Control Plane Elements  . . . . . . . . . . . . . . . . . . .  15
   6.  Extension for Adapting to NSH-Unaware Service Functions . . .  16
     6.1.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . .  17
     6.2.  Requirements for IBN  . . . . . . . . . . . . . . . . . .  18
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
     9.1.  Control Plane . . . . . . . . . . . . . . . . . . . . . .  20
     9.2.  Infinite Forwarding Loops . . . . . . . . . . . . . . . .  20
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  20
     10.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Appendix A.  Examples of Hierarchical Service Function Chaining .  22
     A.1.  Reducing the Number of Service Function Paths . . . . . .  22
     A.2.  Managing a Distributed Data-Center Network  . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

1.  Introduction

   Service Function Chaining (SFC) is a technique for prescribing
Show full document text