Dmr Reception; Two-Way Eth-Dm Statistics; Two-Way Eth-Dm Frame Counts - Juniper ACX1000 Configuration Manual

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Chapter 34: Configuring Operations, Administration, and Management (OAM)

DMR Reception

When an MEP receives a valid DMR, the router that contains the MEP measures the

two-way delay for that frame based on the following sequence of timestamps:

A two-way frame delay is calculated as follows:

The calculation show that frame delay is the difference between the time at which the

initiator MEP sends a DMM frame and the time at which the initiator MEP receives the

associated DMR frame from the responder MEP, minus the time elapsed at the responder

The delay variation is the difference between the current and previous delay values.

The router that contains the initiator MEP stores each set of two-way delay statistics in

the ETH-DM database. The ETH-DM database collects up to 100 sets of statistics for

any given CFM session (pair of peer MEPs). You can access these statistics at any time

by displaying the ETH-DM database contents.

Each router counts the number of two-way ETH-DM frames sent and received:

For an initiator MEP, the router counts the number DMM frames transmitted, the number

of valid DMR frames received, and the number of invalid DMR frames received.

For a responder MEP, the router counts the number of DMR frames sent.

Each router stores ETH-DM frame counts in the CFM database. The CFM database stores

CFM session statistics and, for interfaces that support ETH-DM, any ETH-DM frame

counts. You can access the frame counts at any time by displaying CFM database

information for Ethernet interfaces assigned to MEPs or for MEPs in CFM sessions.

For a given two-way Ethernet frame delay measurement, frame delay

and frame delay variation values are available only at the router that contains

the initiator MEP.

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