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Guidelines for Configuring Routers to Support an ETH-DM Session
Keep the following guidelines in mind when configuring routers to support an Ethernet
frame delay measurement (ETH-DM) session:
Configuration Requirements for ETH-DM
You can obtain ETH-DM information for a link that meets the following requirements:
ETH-DM frame counts are collected at both MEPs and are stored in the respective
CFM databases.
If graceful Routing Engine switchover (GRES) occurs, any collected ETH-DM
statistics are lost, and ETH-DM frame counts are reset to zeroes. GRES enables
a router with dual Routing Engines to switch from a master Routing Engine to a
backup Routing Engine without interruption to packet forwarding. For more
information, see the JUNOS High Availability Configuration Guide.
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.
Guidelines for Configuring Routers to Support an ETH-DM Session on page 745
Guidelines for Starting an ETH-DM Session on page 746
Guidelines for Managing ETH-DM Statistics and ETH-DM Frame Counts on page 748
Example: One-Way Ethernet Frame Delay Measurement on page 761
Configuration Requirements for ETH-DM on page 745
Configuration Options for ETH-DM on page 746
The measurements can be performed between peer maintenance association
endpoints (MEPs) on two routers.
The two MEPs must be configured on two Ethernet physical interfaces or on two
Ethernet logical interfaces. For more information, see "Configuring a Maintenance
Endpoint" on page 709 and Configuring a Remote Maintenance End Point.
The two MEPs must be configured—on their respective routers—under the same
maintenance association (MA) identifier. For more information, see "Creating a
Maintenance Association" on page 708.
On both routers, the MA must be associated with the same maintenance domain
(MD) name. For more information, see "Creating the Maintenance Domain" on
page 705.
On both routers, periodic packet management (PPM) must be running on the
Routing Engine and Packet Forwarding Engine, which is the default configuration.
You can disable PPM on the Packet Forwarding Engine only. However, the
Ethernet frame delay measurement feature requires that distributed PPM remain
Guidelines for Configuring Routers to Support an ETH-DM Session
Chapter 44: Configuring ITU-T Y.1731 Ethernet Service OAM
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