Service Function Simple Offloads
draft-kumar-sfc-offloads-00

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Service Function Chaining                                       S. Kumar
Internet-Draft                                               J. Guichard
Intended status: Standards Track                                P. Quinn
Expires: September 5, 2015                           Cisco Systems, Inc.
                                                              J. Halpern
                                                                Ericsson
                                                           March 4, 2015

                    Service Function Simple Offloads
                      draft-kumar-sfc-offloads-00

Abstract

   Service Function Chaining (SFC) enables services to be delivered by
   selective traffic steering through an ordered set of service
   functions.  Once classified into an SFC, the traffic for a given flow
   is steered through all the service functions of the SFC for the life
   of the traffic flow even though this is often not necessary.
   Steering traffic to service functions only while required and not
   otherwise, leads to shorter SFC forwarding paths with improved
   latencies, reduced resource consumption and better user experience.

   This document describes the rationale, techniques and necessary
   protocol extensions to achieve such optimization, with focus on one
   such technique termed "simple offloads".

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   This Internet-Draft will expire on September 5, 2015.

Kumar, et al.           Expires September 5, 2015               [Page 1]
Internet-Draft               SFC SF Offloads                  March 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Definition Of Terms . . . . . . . . . . . . . . . . . . . . .   3
   3.  Service Function Path Reduction . . . . . . . . . . . . . . .   4
     3.1.  Bypass  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Simple Offload  . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Stateful SFF  . . . . . . . . . . . . . . . . . . . .   6
       3.2.2.  Packet Re-ordering  . . . . . . . . . . . . . . . . .   6
       3.2.3.  Race Conditions . . . . . . . . . . . . . . . . . . .   7
       3.2.4.  Policy Implications . . . . . . . . . . . . . . . . .   7
       3.2.5.  Capabilities Exchange . . . . . . . . . . . . . . . .   8
   4.  Methods For SFP Reduction . . . . . . . . . . . . . . . . . .   8
     4.1.  SFP In-band Offload . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  Progression Of SFP Reduction  . . . . . . . . . . . .  10
     4.2.  Service Controller Offload  . . . . . . . . . . . . . . .  11
   5.  Simple Offload Data-plane Signaling . . . . . . . . . . . . .  12
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  Standard Class Registry . . . . . . . . . . . . . . . . .  13
       7.1.1.  Simple Offloads TLV . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   Service function chaining involves steering traffic flows through a
   set of service functions in a specific order.  Such an ordered list
   of service functions is called a Service Function Chain (SFC).  The
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