Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Junos ®
OS 12.3 Ethernet Interfaces Configuration Guide
Figure 25: Relationship of MEPs, MIPs, and Maintenance Domain Levels
NOTE: Maintenance intermediate points (MIP) are not supported on the ACX
Series routers.
Ethernet Frame Delay Measurement
Two key objectives of OAM functionality are to measure quality-of-service attributes
such as frame delay and frame delay variation (also known as “frame jitter”). Such
measurements can enable you to identify network problems before customers are
impacted by network defects.
Junos OS supports Ethernet frame delay measurement between MEPs configured on
Ethernet physical or logical interfaces on MX Series routers. Ethernet frame delay
measurement provides fine control to operators for triggering delay measurement on a
given service and can be used to monitor SLAs. Ethernet frame delay measurement also
collects other useful information, such as worst and best case delays, average delay,
and average delay variation. The Junos OS implementation of Ethernet frame delay
measurement (ETH-DM) is fully compliant with the ITU-T Recommendation Y.1731, OAM
Functions and Mechanisms for Ethernet-based Networks. The recommendation defines
OAM mechanisms for operating and maintaining the network at the Ethernet service
layer, which is called the "ETH layer" in ITU-T terminology.
MX Series routers with modular port concentrators (MPCs) and 10-Gigabit Ethernet
MPCs with SFP+ support ITU-T Y.1731 functionality on VPLS for frame-delay and
delay-variation.
One-Way Ethernet Frame Delay Measurement
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In one-way ETH-DM mode, a series of frame delay and frame delay variation values are
calculated based on the time elapsed between the time a measurement frame is sent
from the initiator MEP at one router and the time when the frame is received at the receiver
MEP at the other router.
Copyright © 2012, Juniper Networks, Inc.