In-band Edge-to-Edge Round Trip Time Measurement
draft-song-ippm-inband-e2e-rtt-measurement-00
IPPM H. Song
Internet-Draft D. Linda
Intended status: Standards Track Futurewei Technologies
Expires: June 3, 2021 November 30, 2020
In-band Edge-to-Edge Round Trip Time Measurement
draft-song-ippm-inband-e2e-rtt-measurement-00
Abstract
This draft describes a lightweight in-band edge-to-edge network round
trip time measurement architecture and suggests implementations.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119][RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on June 3, 2021.
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Internet-Draft In-band E2E RTT Measurement November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. In-band E2E RTT Measurement Architecture . . . . . . . . . . 3
3. Implementation Considerations . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
In-network service-based traffic engineering or load balancing needs
to monitor particular flows' edge-to-edge performance, such as round
trip time (RTT), in the operator's network domain. The host-based
ping using ICMPv6 [RFC4443] is of no use because it is usually beyond
the access of network operators. The router-based ping, as an active
measurement approach, cannot reflect the real performance of the
specific flows under scrutiny. This is also true for the other
active measurement approaches such as TWAMP [RFC5357].
In-situ OAM (IOAM) [I-D.ietf-ippm-ioam-data] supports in-band flow-
based performance measurement. However, on the one hand, the IOAM
trace option is too heavy for the applications which do not care
about the per-hop performance; on the other hand, the IOAM E2E option
only supports the one-way measurement.
Alternate Marking(AM) [RFC8321], mainly designed for one-way
measurement, can be used to measure the two-way edge-to-edge delay if
both edges initiate a one-way measurement session. However, AM's
measurement interval needs to be large enough to avoid the
measurement ambiguity, and it requires both edges to conduct the
measurements and export results to a controller.
We need a lightweight in-band flow RTT measurement method.
"Lightweight" means the extra header overhead is low, and the extra
network processing overhead is also low. A network operator should
be able to pick a flow to monitor and get find-grained per-packet RTT
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