Problem Statement of Signal Degrade Indication for SR over MPLS
draft-yang-mpls-ps-sdi-sr-01

Document Type Active Internet-Draft (individual)
Authors Fan Yang  , Liuyan Han  , Junfeng Zhao 
Last updated 2020-11-02
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MPLS Working Group                                               F. Yang
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                    L. Han
Expires: May 6, 2021                                        China Mobile
                                                                 J. Zhao
                  China Academy of Information Communications Technology
                                                        November 2, 2020

    Problem Statement of Signal Degrade Indication for SR over MPLS
                      draft-yang-mpls-ps-sdi-sr-01

Abstract

   This document outlines the problem statements and the use cases
   needed to be taken into account when the signal degrade is detected
   and indicated in Segment Routing (SR) over MPLS networks.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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Yang, et al.               Expires May 6, 2021                  [Page 1]
Internet-Draft                                             November 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Statement and Use Case  . . . . . . . . . . . . . . .   3
     3.1.  Overview of Signal Degrade in SR over MPLS Network  . . .   3
     3.2.  Influence on Voice and Data Service . . . . . . . . . . .   4
     3.3.  Engineering Considerations  . . . . . . . . . . . . . . .   4
       3.3.1.  Signal Degrade in Diversity of PHYs . . . . . . . . .   4
       3.3.2.  Performance Management Detection  . . . . . . . . . .   4
       3.3.3.  BFD Detection . . . . . . . . . . . . . . . . . . . .   5
     3.4.  LER and LSR Consideration . . . . . . . . . . . . . . . .   5
     3.5.  Signal Degrade Approach . . . . . . . . . . . . . . . . .   5
     3.6.  Parameter Threshold . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Signal Failure (SF) and Signal Degrade (SD) are categorized as the
   trigger to bring the survivability challenge to the network in
   [RFC4428].  Signal Failure (SF) can be interpreted as the absence of
   the network resources, and Signal Degrade (SD) can be regarded as the
   decrease of the signal quality quantifiable measurement.  The
   meanings of signal failure is straightforward, indicating the failure
   of the interfaces, links or nodes.  Meanwhile, fiber aging, fiber
   impairment, fiber pollution, optical module mismatch or WDM
   transmission error are the potential reasons to generate signal
   degrade.

   Segment Routing(SR) leverages the source routing paradigm.  In the
   era of source routing paradigm, Segment Routing over MPLS (SR-MPLS)
   [RFC8402] has been widely utilized for different kinds of network
   scenarios.  It is valuable to investigate the necessity of supporting
   detection of Signal Degrade (SD) in the source routing paradigm.
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