Ethernet Frame Loss Measurement Overview - Juniper ACX1000 Configuration Manual

Ethernet Frame Loss Measurement Overview

Copyright © 2017, Juniper Networks, Inc.
Chapter 34: Configuring Operations, Administration, and Management (OAM)
The key objectives of the OAM functionality are to measure quality-of-service attributes
such as frame delay, frame delay variation (also known as "frame jitter"), and frame loss.
Such measurements enable you to identify network problems before customers are
impacted by network defects. For more information about Ethernet frame delay
measurement, see Ethernet Frame Delay Measurements Overview.
Junos OS supports Ethernet frame loss measurement (ETH-LM) between maintenance
association end points (MEPs) configured on Ethernet physical or logical interfaces on
MX Series routers and is presently supported only for VPWS service. ETH-LM is used by
operators to collect counter values applicable for ingress and egress service frames.
These counters maintain a count of transmitted and received data frames between a
pair of MEPs. Ethernet frame loss measurement is performed by sending frames with
ETH-LM information to a peer MEP and similarly receiving frames with ETH-LM information
from the peer MEP. This type of frame loss measurement is also known as single-ended
Ethernet loss measurement.
NOTE: MX Series Virtual Chassis does not support Ethernet frame loss
measurement (ETH-LM).
ETH-LM supports the following frame loss measurements:
Near-end frame loss measurement—Measurement of frame loss associated with
ingress data frames.
Far-end frame loss measurement—Measurement of frame loss associated with egress
data frames.
NOTE: The proactive and dual-ended loss measurement functionality of
ITU-T Y1731 is not supported on the ACX Series routers.
The ETH-LM feature is supported on aggregated Ethernet interfaces.
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