Hierarchical Service Function Chaining (hSFC)
draft-ietf-sfc-hierarchical-05

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Replaces draft-dolson-sfc-hierarchical
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Service Function Chaining                                      D. Dolson
Internet-Draft                                                  Sandvine
Intended status: Informational                                  S. Homma
Expires: May 17, 2018                                                NTT
                                                                D. Lopez
                                                          Telefonica I+D
                                                            M. Boucadair
                                                                  Orange
                                                       November 13, 2017

             Hierarchical Service Function Chaining (hSFC)
                     draft-ietf-sfc-hierarchical-05

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

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   This Internet-Draft will expire on May 17, 2018.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Dolson, et al.            Expires May 17, 2018                  [Page 1]
Internet-Draft                    hSFC                     November 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Hierarchical Service Function Chaining (hSFC) . . . . . . . .   4
     2.1.  Top Level . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Lower Levels  . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Internal Boundary Node (IBN)  . . . . . . . . . . . . . . . .   7
     3.1.  IBN Path Configuration  . . . . . . . . . . . . . . . . .   8
       3.1.1.  Flow-Stateful IBN . . . . . . . . . . . . . . . . . .   8
       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  . . . . . . . . . . . . . . . . .  13
     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 .  21
     A.1.  Reducing the Number of Service Function Paths . . . . . .  22
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