Controlled Return Path for Service Function Chain (SFC) OAM
draft-ao-sfc-oam-return-path-specified-00

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SFC WG                                                             T. Ao
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                               G. Mirsky
Expires: December 31, 2017                                     ZTE Corp.
                                                                 Z. Chen
                                                           China Telecom
                                                           June 29, 2017

      Controlled Return Path for Service Function Chain (SFC) OAM
               draft-ao-sfc-oam-return-path-specified-00

Abstract

   This document defines extensions to the Service Function Chain (SFC)
   Operation, Administration and Maintenance (OAM) that enable control
   of the Echo Reply return path by specifying it as Reverse Service
   Function Path.  Enforcing the specific return path can be used to
   verify bidirectional connectivity of SFC and increase robustness of
   SFC OAM.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on December 31, 2017.

Copyright Notice

   Copyright (c) 2017 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
   (http://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

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   to this document.  Code Components extracted from this document must
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Extension . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  SFC Reply Path TLV  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Theory of Operation . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Case of Bi-directional SFC  . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  SFC Return Path Type  . . . . . . . . . . . . . . . . . .   6
     7.2.  New Return Codes  . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   While Echo Request, defined in [I-D.ooamdt-rtgwg-demand-cc-cv],
   always traverses the Service Function Chain (SFC) it directed to, the
   corresponding Echo Reply is sent over IP network
   [I-D.wang-sfc-multi-layer-oam].  There are scenarios when it is
   beneficial to direct the responder to use path other than the IP
   network.  This document defines extensions to the Service Function
   Chain (SFC) Operation, Administration and Maintenance (OAM) that
   enable control of the Echo Reply return path by specifying it as
   Reply Service Function Path.  This document defines a new Type-
   Length-Value (TLV), Reply Service Function Path TLV, for Reply via
   Specified Path mode of Overlay Echo Reply (Section 4).

   The Reply Service Function Path TLV provides efficient mechanism to
   test bidirectional and hybrid SFCs, as these were defined in
   Section 2.2 [RFC7665], that allows an operator to test both
   directions of the bidirectional or hybrid SFP with a single Overlay
   Echo Request/Echo Reply operation.

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2.  Conventions used in this document
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