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