MPLS-based Service Function Path(SFP) Consistency Verification
draft-lm-mpls-sfc-path-verification-01

Document Type Active Internet-Draft (individual)
Authors Liu Yao  , Greg Mirsky 
Last updated 2020-10-25
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MPLS Working Group                                                Y. Liu
Internet-Draft                                                 G. Mirsky
Intended status: Standards Track                         ZTE Corporation
Expires: April 28, 2021                                 October 25, 2020

     MPLS-based Service Function Path(SFP) Consistency Verification
                 draft-lm-mpls-sfc-path-verification-01

Abstract

   This document proposes a method to verify the correlation between
   Service Function Chaining control and/or management plane view of the
   specified Service Function Path and the state of its data.  It works
   for both SR service programming and MPLS-based NSH SFC.

   This document defines the signaling of the Generic Associated Channel
   (G-ACh) over a Service Function Path (SFP) with an MPLS forwarding
   plane using the basic unit defined in RFC 8595.  The document also
   describes the processing of the G-ACh by the elements of the SFP.

Status of This Memo

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   This Internet-Draft will expire on April 28, 2021.

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   Copyright (c) 2020 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
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   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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  MPLS-based SFP Consistency Verification . . . . . . . . . . .   4
     3.1.  Special-purpose Label in SFC-MPLS Environment . . . . . .   5
       3.1.1.  G-ACh over SFC-MPLS . . . . . . . . . . . . . . . . .   6
     3.2.  MPLS-based SFP Consistency Verification . . . . . . . . .   6
     3.3.  SFC Info Sub-TLV  . . . . . . . . . . . . . . . . . . . .   7
     3.4.  SFC Basic Unit FEC Sub-TLV  . . . . . . . . . . . . . . .   8
     3.5.  Theory of Operation . . . . . . . . . . . . . . . . . . .   9
       3.5.1.  MPLS-based service programming  . . . . . . . . . . .  10
       3.5.2.  Path Consistency in SFC-MPLS  . . . . . . . . . . . .  10
     3.6.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .  10
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  SFC Validation TLV  . . . . . . . . . . . . . . . . . . .  11
       5.1.1.  Sub-TLVs for SFC Validation TLV . . . . . . . . . . .  11
     5.2.  SFC Basic Unit sub-TLV  . . . . . . . . . . . . . . . . .  12
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   Service Function Chain (SFC) defined in [RFC7665] as an ordered set
   of service functions (SFs) to be applied to packets and/or frames,
   and/or flows selected as a result of classification.

   SFC can be achieved through a variety of encapsulation methods, such
   as NSH [RFC8300], SR service programming
   [I-D.ietf-spring-sr-service-programming] and MPLS-based NSH SFC
   [RFC8595].

   This document describes extensions to MPLS LSP ping [RFC8029]
   mechanisms to support verification between the control/management
   plane and the data plane state for both SR-MPLS service programming
   and MPLS-based NSH SFC.

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