Hierarchical Service Function Chaining (hSFC)
RFC 8459

Document Type RFC - Experimental (September 2018; No errata)
Last updated 2018-09-18
Replaces draft-dolson-sfc-hierarchical
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Behcet Sarikaya
Shepherd write-up Show (last changed 2018-02-20)
IESG IESG state RFC 8459 (Experimental)
Consensus Boilerplate Yes
Telechat date
Responsible AD Martin Vigoureux
Send notices to Behcet Sarikaya <sarikaya@ieee.org>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                         D. Dolson
Request for Comments: 8459                                      Sandvine
Category: Experimental                                          S. Homma
ISSN: 2070-1721                                                      NTT
                                                                D. Lopez
                                                          Telefonica I+D
                                                            M. Boucadair
                                                                  Orange
                                                          September 2018

             Hierarchical Service Function Chaining (hSFC)

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 design,
   simpler to control, and supportive of independent functional groups
   within large network operators.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are candidates for any level of
   Internet Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8459.

Dolson, et al.                Experimental                      [Page 1]
RFC 8459                          hSFC                    September 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
   (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.

Dolson, et al.                Experimental                      [Page 2]
RFC 8459                          hSFC                    September 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Experiment Goals  . . . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Hierarchical Service Function Chaining (hSFC) . . . . . . . .   6
     3.1.  Upper Level . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Lower Levels  . . . . . . . . . . . . . . . . . . . . . .   8
   4.  Internal Boundary Node (IBN)  . . . . . . . . . . . . . . . .  10
     4.1.  IBN Path Configuration  . . . . . . . . . . . . . . . . .  10
       4.1.1.  Flow-Stateful IBN . . . . . . . . . . . . . . . . . .  11
       4.1.2.  Encoding Upper-Level Paths in Metadata  . . . . . . .  12
       4.1.3.  Using Unique Paths per Upper-Level Path . . . . . . .  13
       4.1.4.  Nesting Upper-Level NSH within Lower-Level NSH  . . .  13
       4.1.5.  Stateful/Metadata Hybrid  . . . . . . . . . . . . . .  14
     4.2.  Gluing Levels Together  . . . . . . . . . . . . . . . . .  16
     4.3.  Decrementing Service Index  . . . . . . . . . . . . . . .  16
     4.4.  Managing TTL  . . . . . . . . . . . . . . . . . . . . . .  16
   5.  Subdomain Classifier  . . . . . . . . . . . . . . . . . . . .  17
   6.  Control Plane Elements  . . . . . . . . . . . . . . . . . . .  18
   7.  Extension for Adapting to NSH-Unaware Service Functions . . .  18
     7.1.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . .  19
     7.2.  Requirements for an IBN . . . . . . . . . . . . . . . . .  20
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
     9.1.  Control Plane . . . . . . . . . . . . . . . . . . . . . .  21
     9.2.  Infinite Forwarding Loops . . . . . . . . . . . . . . . .  22
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     10.2.  Informative References . . . . . . . . . . . . . . . . .  22
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