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CHAPTER 11
ITU-T Y.1731 Ethernet Frame Delay
Measurements
•
Ethernet Frame Delay Measurements on page 119
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ConfiguringMEP Interfaces toSupportEthernetFrameDelay Measurementson page122
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Triggering an Ethernet Frame Delay Measurements Session on page 123
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Viewing Ethernet Frame Delay Measurements Statistics on page 124
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Example: Configuring One-Way Ethernet Frame Delay Measurements with
Single-Tagged Interfaces on page 125
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Example: Configuring Two-Way Ethernet Frame Delay Measurements with
Single-Tagged Interfaces on page 130
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Example: Configuring Ethernet Frame Delay Measurements with Untagged
Interfaces on page 134
Ethernet Frame Delay Measurements
Performance managementdependson theaccurate measurementofserviceagreement
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.Thisis wherethe abilitytoconfigureand monitorEthernet framedelay is helpful.
On a Juniper NetworksMX Series Ethernet ServicesRouter equipped with theDistributed
Port Concentrator(MX-DPC) only, you canperform Ethernetframedelaymeasurements
(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 offramedelay andframe delayvariation(jitter).You canconfigure Ethernet
frame delay measurement in either one-way or two-way (round-trip) mode to gather
framedelaystatisticsand simultaneousstatisticsfrommultiplesessions.Ethernetframe
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