Hierarchical Service Function Chaining (hSFC)
draft-ietf-sfc-hierarchical-10

Document Type Active Internet-Draft (sfc WG)
Last updated 2018-06-22
Replaces draft-dolson-sfc-hierarchical
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Service Function Chaining                                      D. Dolson
Internet-Draft                                                  Sandvine
Intended status: Experimental                                   S. Homma
Expires: December 23, 2018                                           NTT
                                                                D. Lopez
                                                          Telefonica I+D
                                                            M. Boucadair
                                                                  Orange
                                                           June 21, 2018

             Hierarchical Service Function Chaining (hSFC)
                     draft-ietf-sfc-hierarchical-10

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 December 23, 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 December 23, 2018               [Page 1]
Internet-Draft                    hSFC                         June 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Experiment Goals  . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Hierarchical Service Function Chaining (hSFC) . . . . . . . .   5
     3.1.  Top Level . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Lower Levels  . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Internal Boundary Node (IBN)  . . . . . . . . . . . . . . . .   9
     4.1.  IBN Path Configuration  . . . . . . . . . . . . . . . . .   9
       4.1.1.  Flow-Stateful IBN . . . . . . . . . . . . . . . . . .  10
       4.1.2.  Encoding Upper-Level Paths in Metadata  . . . . . . .  11
       4.1.3.  Using Unique Paths per Upper-Level Path . . . . . . .  12
       4.1.4.  Nesting Upper-Level NSH within Lower-Level NSH  . . .  12
       4.1.5.  Stateful/Metadata Hybrid  . . . . . . . . . . . . . .  13
     4.2.  Gluing Levels Together  . . . . . . . . . . . . . . . . .  15
     4.3.  Decrementing Service Index  . . . . . . . . . . . . . . .  15
     4.4.  Managing TTL  . . . . . . . . . . . . . . . . . . . . . .  15
   5.  Sub-domain Classifier . . . . . . . . . . . . . . . . . . . .  16
   6.  Control Plane Elements  . . . . . . . . . . . . . . . . . . .  17
   7.  Extension for Adapting to NSH-Unaware Service Functions . . .  17
     7.1.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . .  18
     7.2.  Requirements for IBN  . . . . . . . . . . . . . . . . . .  19
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
     9.1.  Control Plane . . . . . . . . . . . . . . . . . . . . . .  20
     9.2.  Infinite Forwarding Loops . . . . . . . . . . . . . . . .  21
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  21
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  21
     11.2.  Informative References . . . . . . . . . . . . . . . . .  22
   Appendix A.  Examples of Hierarchical Service Function Chaining .  23
     A.1.  Reducing the Number of Service Function Paths . . . . . .  23
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