Problem Statement of Signal Degrade Indication for Segment Routing over MPLS Network
draft-yang-mpls-ps-sdi-sr-00

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Multiprotocol Label Switching Working Group                      F. Yang
Internet-Draft                                                    Huawei
Intended status: Informational                                    L. Han
Expires: September 10, 2020                                 China Mobile
                                                                 J. Zhao
                                                                   CAICT
                                                           March 9, 2020

Problem Statement of Signal Degrade Indication for Segment Routing over
                              MPLS Network
                      draft-yang-mpls-ps-sdi-sr-00

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 the networks of Segment Routing (SR) over MPLS.

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].

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 September 10, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft        draft-yang-mpls-ps-sdi-sr-00            March 2020

   This document is subject to BCP 78 and the IETF Trust's Legal
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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  . . . . . . . . . . . . . . .   5
       3.3.1.  Signal Degrade in Diversity of PHYs . . . . . . . . .   5
       3.3.2.  Performance Management Detection  . . . . . . . . . .   5
       3.3.3.  BFD Detection . . . . . . . . . . . . . . . . . . . .   5
     3.4.  LER and LSR Consideration . . . . . . . . . . . . . . . .   5
     3.5.  Signal Degrade Approach . . . . . . . . . . . . . . . . .   6
     3.6.  Isolation of Signal Degrade Detection and Protection  . .   6
     3.7.  Parameter Threshold . . . . . . . . . . . . . . . . . . .   6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Signal Failure (SF) and Signal Degradation (SD) are categorized as
   the trigger to bring the survivability challenge to the network in
   [RFC6372].  Signal Failure (SF) can be interpreted as the absence of
   the network resources, and Signal Degradation (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.

   In [RFC6378], linear protection mechanisms for the MPLS Transport
   Profile (MPLS-TP) are introduced, and the protection switching

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