NOTE: MX Series Virtual Chassis does not support Ethernet synthetic loss
measurement (ETH-SLM).
Single-ended ETH-SLM is used to perform on-demand or proactive tests by initiating a
finite amount of ETH-SLM frames to one or multiple MEP peers and receiving the ETH-SLM
reply from the peers. The ETH-SLM frames contain the ETH-SLM information that is
used to measure and report both near-end and far-end synthetic loss measurements.
Service-level agreement (SLA) measurement is the process of monitoring the bandwidth,
delay, delay variation (jitter), continuity, and availability of a service. It enables you to
identify network problems before customers are impacted by network defects. In proactive
mode, SLA measurements are triggered by an iterator application. An iterator is designed
to periodically transmit SLA measurement packets in the form of ITU-Y.1731-compliant
frames for synthetic frame loss measurement . This mode differs from on-demand SLA
measurement, which is user initiated. In on-demand mode, the measurements are
triggered by the user through the CLI. When the user triggers the ETH-SLM through the
CLI, the SLM request that is generated is as per the frame formats specified by the ITU-T
Y.1731 standard.
NOTE: ACX5048 and ACX5096 routers support ETH-SLM for Layer 2 services.
Related
Documentation
Transmission of ETH-SLM Messages on page 1141•
• Format of ETH-SLM Messages on page 1144
• Guidelines for Configuring ETH-SLM on page 1146
• Scenarios for Configuration of ETH-SLM on page 1147
• Managing ETH-SLM Statistics and ETH-SLM Frame Counts on page 1148
• Starting a Proactive ETH-SLM Session on page 1153
• Starting an On-Demand ETH-SLM Session on page 1156
• Troubleshooting Failures with ETH-SLM
• Ethernet Interfaces Feature Guide for Routing Devices
Transmission of ETH-SLM Messages
The ETH-SLM functionality can process multiple synthetic loss message (SLM) requests
simultaneously between a pair of MEPs. The session can be a proactive or an on-demand
SLM session. Each SLM request is identified uniquely by a test ID.
A MEP can send SLM requests or respond to SLM requests. A response to an SLM request
is called a synthetic loss reply (SLR). After a MEP determines an SLM request by using
the test ID, the MEP calculates the far-end and near-end frame loss on the basis of the
information in the SLM message or the SLM protocol data unit (PDU).
1141Copyright © 2017, Juniper Networks, Inc.
Chapter 34: Configuring Operations, Administration, and Management (OAM)
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