Network Working Group A. Capello
Internet-Draft M. Cociglio
Intended status: Experimental L. Castaldelli
Expires: August 29, 2013 Telecom Italia
A. Tempia Bonda
February 25, 2013
A packet based method for passive performance monitoring
draft-tempia-opsawg-p3m-03.txt
Abstract
This document describes a passive method to perform packet loss,
delay and jitter measurements on live traffic. Implementation and
deployment details are also explained in order to clarify how the
tools and features currently available on existing routing platforms
can be used to implement the method. This method has been invented
and engineered in Telecom Italia and it's currently being used in
Telecom Italia's network.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
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This Internet-Draft will expire on August 29, 2013.
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to this document.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview of the method . . . . . . . . . . . . . . . . . . . . 5
3. Detailed description of the method . . . . . . . . . . . . . . 7
3.1. Packet loss measurement . . . . . . . . . . . . . . . . . 7
3.2. One-way delay measurement . . . . . . . . . . . . . . . . 10
3.2.1. Average delay . . . . . . . . . . . . . . . . . . . . 12
3.3. Delay variation measurement . . . . . . . . . . . . . . . 12
4. Implementation and deployment . . . . . . . . . . . . . . . . 13
4.1. Colouring the packets . . . . . . . . . . . . . . . . . . 14
4.2. Counting the packets . . . . . . . . . . . . . . . . . . . 15
4.3. Collecting data and calculating packet loss . . . . . . . 16
5. Security Considerations . . . . . . . . . . . . . . . . . . . 17
6. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 20
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9.1. Normative References . . . . . . . . . . . . . . . . . . . 21
9.2. Informative References . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22
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1. Introduction
Nowadays, most of the traffic in Service Providers' networks carries
multimedia content. Video contents are highly sensitive to packet
loss [RFC2680], while interactive contents are sensitive to delay
[RFC2679], and jitter [RFC3393].
In front of this scenario, Service Providers need methodologies and
tools to monitor and measure network performances with an adequate
accuracy, in order to constantly control the quality of experience
perceived by their customers. On the other hand, performance
monitoring provides useful information for improving network
management (e.g. isolation of network problems, troubleshooting,
etc.).
A lot of work related to OAM, that includes also performance
monitoring techniques, has been done by Standards Developing
Organizations: [I-D.ietf-opsawg-oam-overview] provides a good
datatracker.ietf.org