Controlled Return Path for Service Function Chain (SFC) OAM
draft-ao-sfc-oam-return-path-specified-04

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SFC WG                                                             T. Ao
Internet-Draft                                                Individual
Intended status: Standards Track                               G. Mirsky
Expires: December 6, 2019                                      ZTE Corp.
                                                                 Z. Chen
                                                           China Telecom
                                                            June 4, 2019

      Controlled Return Path for Service Function Chain (SFC) OAM
               draft-ao-sfc-oam-return-path-specified-04

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 the 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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 6, 2019.

Copyright Notice

   Copyright (c) 2019 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
   (https://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
   include Simplified BSD License text as described in Section 4.e of
   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.  Bi-directional SFC Case . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     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 Service Function Chain (SFC) Echo Request, defined in
   [I-D.ietf-sfc-multi-layer-oam], always traverses the SFC it directed
   to, the corresponding Echo Reply is sent over IP network
   [I-D.ietf-sfc-multi-layer-oam].  There are scenarios when it is
   beneficial to direct the responder to use a 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 SFC Echo Reply (Section 4).

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

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