Off-Path Signaling Protocol for Service Function Chaining
draft-femmreali-sfc-offpath-signaling-03

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Internet Engineering Task Force                          M. Femminella
SFC Working Group                                            G. Reali
Internet Draft                                   University of Perugia
Intended status: Informational                            D. Valocchi
                                             University College London
Expires: June 2017                                    December 1, 2016

         Off-Path Signaling Protocol for Service Function Chaining
                 draft-femmreali-sfc-offpath-signaling-03

Abstract

   This document illustrates a reference protocol able to discover
   deployed instances of Service Functions (SFs), which can be located
   also off-path with respect to the IP datapath between flow source
   and flow destination. It is an application protocol organized in two
   layers: signaling transport, which deal lower layer signaling
   transport, and signaling application, which directly interfaces with
   the intended SF. Discovery of SFs is a primary step to for
   implementing Service Function Chaining (SFC).

Status of this Memo

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   This Internet-Draft will expire on June 1, 2009.

Femminella et al.,      Expires June 1, 2017                  [Page 1]
 
Internet-Draft   Off-Path Signaling Protocol for SFC      December 2016

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Table of Contents

   1. Introduction ................................................ 3
      1.1. Document scope ......................................... 4
   2. Conventions used in this document                                            ............................ 5
   3. Related work ................................................ 5
      3.1. Signaling protocols in data network ..................... 5
      3.2. Platforms for hosting virtualized SFs ................... 6
      3.3. Service redirect solutions                                          .............................. 7
   4. Off-path Signaling Protocol description ...................... 7
      4.1. The peer discovery in the Signaling Transport layer                                                                  ...... 8
      4.2. Signaling distribution                                      ................................. 13
         4.2.1. Finite state machines for SA and ST ............... 15
         4.2.2. ST messages                                ....................................... 25
         4.2.3. Error management and termination procedures                                                               ........ 27
         4.2.4. Forwarder management procedures ................... 28
         4.2.5. SA messages                                ....................................... 28
   5. Transport Layer Considerations                                         .............................. 30
      5.1. Peer discovery ........................................ 30
      5.2. Signaling distribution                                      ................................. 31
   6. Security Considerations                                  ..................................... 32
   7. IANA Considerations ........................................ 32
   8. Conclusions ................................................ 32
   9. References ................................................. 32
      9.1. Normative References                                    ................................... 32
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