Performance Measurement Using TWAMP Light for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-10
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SPRING Working Group R. Gandhi, Ed.
Internet-Draft C. Filsfils
Intended status: Informational Cisco Systems, Inc.
Expires: February 7, 2021 D. Voyer
Bell Canada
M. Chen
Huawei
B. Janssens
Colt
August 6, 2020
Performance Measurement Using TWAMP Light for Segment Routing Networks
draft-gandhi-spring-twamp-srpm-10
Abstract
Segment Routing (SR) leverages the source routing paradigm. SR is
applicable to both Multiprotocol Label Switching (SR-MPLS) and IPv6
(SRv6) data planes. This document describes procedure for sending
and processing probe query and response messages for Performance
Measurement (PM) in Segment Routing networks. The procedure uses the
messages defined in RFC 5357 (Two-Way Active Measurement Protocol
(TWAMP) Light) for Delay Measurement, and uses the messages defined
in this document for Loss Measurement. The procedure described is
applicable to SR-MPLS and SRv6 data planes and is used for both Links
and end-to-end SR Paths including SR Policies.
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
working documents as Internet-Drafts. The list of current Internet-
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 February 7, 2021.
Gandhi, et al. Expires February 7, 2021 [Page 1]
Internet-Draft TWAMP Light for Segment Routing August 2020
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 4
2.3. Reference Topology . . . . . . . . . . . . . . . . . . . 4
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Example Provisioning Model . . . . . . . . . . . . . . . 6
4. Probe Messages . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Probe Query Message . . . . . . . . . . . . . . . . . . . 7
4.1.1. Delay Measurement Query Message . . . . . . . . . . . 7
4.1.2. Loss Measurement Query Message . . . . . . . . . . . 8
4.1.3. Probe Query for Links . . . . . . . . . . . . . . . . 9
4.1.4. Probe Query for SR Policy . . . . . . . . . . . . . . 9
4.1.5. Control Code Field Extension for TWAMP Light Messages 11
4.1.6. Loss Measurement Query Message Extensions . . . . . . 12
4.2. Probe Response Message . . . . . . . . . . . . . . . . . 15
4.2.1. One-way Measurement Mode . . . . . . . . . . . . . . 16
4.2.2. Two-way Measurement Mode . . . . . . . . . . . . . . 16
4.2.3. Loss Measurement Response Message Extensions . . . . 18
4.3. Additional Probe Message Processing Rules . . . . . . . . 20
4.3.1. TTL and Hop Limit . . . . . . . . . . . . . . . . . . 21
4.3.2. Router Alert Option . . . . . . . . . . . . . . . . . 21
4.3.3. UDP Checksum . . . . . . . . . . . . . . . . . . . . 21
5. Performance Measurement for P2MP SR Policies . . . . . . . . 21
6. ECMP Support for SR Policies . . . . . . . . . . . . . . . . 22
7. Performance Delay and Liveness Monitoring . . . . . . . . . . 23
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