Guidelines For Managing Eth-Dm Statistics And Eth-Dm Frame Counts; Eth-Dm Statistics; Eth-Dm Statistics Retrieval - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

JUNOS 10.1 Network Interfaces Configuration Guide
Restrictions for an ETH-DM Session
The following restrictions apply to an ETH-DM session:
Related Topics

Guidelines for Managing ETH-DM Statistics and ETH-DM Frame Counts

748
Guidelines for Managing ETH-DM Statistics and ETH-DM Frame Counts
You cannot run multiple simultaneous ETH-DM sessions with the same remote
MEP or MAC address.
For a given ETH-DM session, you can collect frame delay information for a
maximum of 65,535 frames.
For a given CFM session (pair of peer MEPs), the ETH-DM database stores a
maximum of 100 statistics, with the older statistics being "aged out" as newer
statistics are collected for that pair of MEPs.
For one-way delay measurements collected within the same CFM session,
the 100 most recent ETH-DM statistics can be retrieved at any point of time
at the router on which the receiver MEP is defined.
For two-way delay measurements collected within the same CFM session,
the 100 most recent ETH-DM statistics can be retrieved at any point of time
at the router on which the initiator MEP is defined.
Depending on the number of frames exchanged in the individual ETH-DM
sessions, the ETH-DM database can contain statistics collected through multiple
ETH-DM sessions.
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 data is compromised when the system is changing (such
as from reconfiguration). We recommend performing Ethernet frame delay
measurements on a stable system.
Ethernet Frame Delay Measurements Overview on page 739
Starting an ETH-DM Session on page 756
Guidelines for Managing ETH-DM Statistics and ETH-DM Frame Counts on page 748
monitor ethernet delay-measurement
ETH-DM Statistics on page 749
ETH-DM Statistics Retrieval on page 750
ETH-DM Frame Counts on page 750
ETH-DM Frame Count Retrieval on page 751
operational command