Juniper-networks JUNOS OS 10.4 Manual de usuario descargar pdf (Pagina 145)

CHAPTER 11

ITU-T Y.1731 Ethernet Frame Delay

Measurements

This chapter discusses the following topics:

•

Ethernet Frame Delay Measurements on page 125

•

Configuring MEP Interfaces to Support Ethernet Frame Delay Measurements on page 128

•

Triggering an Ethernet Frame Delay Measurements Session on page 129

•

Viewing Ethernet Frame Delay Measurements Statistics on page 130

•

Example: Configuring One-Way Ethernet Frame Delay Measurements with

Single-Tagged Interfaces on page 131

•

Example: Configuring Two-Way Ethernet Frame Delay Measurements with

Single-Tagged Interfaces on page 136

•

Example: Configuring Ethernet Frame Delay Measurements with Untagged

Interfaces on page 140

Ethernet Frame Delay Measurements

Performance management depends on the accurate measurement of service agreement

objective parameters, which can include bandwidth and reliability. In many cases, a

service provider could be subject to penalties imposed by regulation, statute, or contract

if network performance is not within the bounds established for the service. One key

performance objective is delay, along with its close relative, delay variation (often called

jitter). Some applications will function just as well with high delays across the network

and high delay variations (such as bulk file transfer), while other applications (such as

voice) can only function with low and stable delays. Many networks invoke protocols or

features available at Layer 3 (the packet layer) or higher to measure network delays and

jitter link-by-link. However, when the network consists of many Ethernet links, there is

little available at Layer 2 (the frame layer) that allows routers to measure frame delay

and jitter. This is where the ability to configure and monitor Ethernet frame delay is helpful.

On a Juniper Networks MX Series Ethernet Services Router equipped with the Distributed

Port Concentrator (MX-DPC) only, you can perform Ethernet frame delay measurements

(referred to as ETH-DM in Ethernet specifications). This feature allows you to configure

on-demand Operation, Administration, and Maintenance (OAM) statements for the

measurement of frame delay and frame delay variation (jitter). You can configure Ethernet

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Juniper-networks JUNOS OS 10.4 Manual de usuario Pagina 145