Restrictions for Ethernet Frame Delay Measurement
The following restrictions apply to the Ethernet frame delay measurement feature:
•
Ethernet frame delay measurements can be triggered only when the distributed periodic
packet management daemon (ppm) is enabled. To enable distributed ppm, include
the delegate-server-processing CLI statement at the [edit protocols oam ethernet
connectivity-fault-management performance-monitoring] hierarchy. For more
information about this limitation, see Guidelines for Configuring Routers to Support an
ETH-DM Session and Ensuring That Distributed ppm Is Not Disabled.
•
You can monitor only one session at a time to the same remote MEP or MAC address.
For more information about starting an ETH-DM session, see Starting an ETH-DM
Session.
•
ETH-DM statistics are collected at only one of the two peer routers in the ETH-DM
session. For a one-way ETH-DM session, you can display frame ETH-DM statistics at
the receiver MEP only, using ETH-DM-specific show commands. For a two-way ETH-DM
session, you can display frame delay statistics at the initiator MEP only, using the same
ETH-DM-specific show commands. For more information, see Managing ETH-DM
Statistics and ETH-DM Frame Counts.
•
ETH-DM frame counts are collected at both MEPs and are stored in the respective
CFM databases.
•
Accuracy of frame delay statistics is compromised when the system is changing (such
as from reconfiguration). We recommend performing Ethernet frame delay
measurements on a stable system.
•
One-way Ethernet frame delay measurement is not supported.
Related
Documentation
Understanding Ethernet OAM Link Fault Management for ACX Series Routers on page 1112•
• Guidelines for Configuring Routers to Support an ETH-DM Session
• Guidelines for Starting an ETH-DM Session
• Guidelines for Managing ETH-DM Statistics and ETH-DM Frame Counts
• Ethernet Frame Delay Measurements Overview on page 1117
• Ethernet Frame Loss Measurement Overview on page 1121
• Proactive Mode for SLA Measurement on page 1123
• On-Demand Mode for SLA Measurement on page 1125
• Configuring MEP Interfaces to Support Delay Measurement on page 1125
• Ethernet OAM Connectivity Fault Management on page 1126
• Ethernet Interfaces Feature Guide for Routing Devices
Copyright © 2017, Juniper Networks, Inc.1120
ACX Series Universal Access Router Configuration Guide
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