(Optional) Configuring Frame DM

This section describes how to configure one- and two-way frame delay measurement (DM) to collect reliability statistics for MPLS-TP services.

Context

Frame DM, a performance monitoring function provided by MPLS-TP, calculates the delay on links. The delay can be used to calculate the delay variation. The following DM modes are supported:

One-way frame DM: In a point-to-point ME, a MEP sends DM frames to its RMEP to carry out one-way frame delay and variation measurement.

If the clocks of the two MEPs are synchronized, one-way frame DM can be conducted; otherwise, only two-way frame delay variation can be measured.
Two-way frame DM: In a point-to-point ME, a MEP sends delay measurement messages (DMMs) to its RMEP and receives delay measurement replies (DMRs) from the RMEP to carry out two-way frame delay and variation measurement.

One-way frame DM and two-way frame DM have the same monitoring scenario. The following table describes differences between them.

**Table 1** Differences between one-way frame DM and two-way frame DM
Item	One-Way Frame DM	Two-Way Frame DM
Statistics display	Statistics about one-way frame DM can be displayed using the display mpls-tp oam meg meg-name statistic-type delay-measure one-way command on an RMEP.	Statistics can be displayed using either of the following commands on a MEP: To display statistics about two-way on-demand frame DM, run the delay-measure two-way [ interval interval-value \| count count-value \| exp exp-value \| two-time-stamp ]^* command. To display statistics about two-way frame DM, run the display mpls-tp oam meg meg-name statistic-type delay-measure two-way command.
Monitoring scenario	On-demand monitoring Proactive monitoring	On-demand monitoring Proactive monitoring

The procedure for configuring one-way or two-way frame DM is as follows:

All the steps must be performed on both the MEP and RMEP unless otherwise specified.

Procedure

Run system-view
The system view is displayed.
Run mpls-tp meg meg-name
A MEG is created, and the MEG view is displayed.
Choose one of the following sub-procedures as needed:
- Configure one-way frame DM. Run any of the following commands:
  - Run delay-measure one-way [ interval interval-value | count count-value | exp exp-value ] ^*
    
    One-way on-demand frame DM is enabled.
    
    Run either of the following commands to view statistics about one-way on-demand frame DM as needed:
    - If the delay-measure one-way command has been run on the MEP to measure the delay on the link from the MEP to the RMEP, run the display mpls-tp oam meg meg-name statistic-type delay-measure one-way command on the RMEP to view DM results.
    - If the delay-measure one-way command has been run on the RMEP to measure the delay on the link from the RMEP to the MEP, run the display mpls-tp oam meg meg-name statistic-type delay-measure one-way command on the MEP to view DM results.
  - On the MEP, run delay-measure one-way proactive [ interval interval-value | exp exp-value ] ^*
    
    One-way proactive frame DM is enabled.
    
    On the RMEP, run delay-measure one-way proactive receive enable
    
    The receive function is enabled for one-way proactive frame DM.
    
    Run either of the following commands to view statistics about one-way proactive frame DM as needed:
    - If the delay-measure one-way proactive command has been run on the MEP, run the display mpls-tp oam meg meg-name statistic-type delay-measure one-way command on the RMEP to view statistics about one-way proactive frame DM in the direction from the MEP to its RMEP.
    - If the delay-measure one-way proactive command has been run on the RMEP, run the display mpls-tp oam meg meg-name statistic-type delay-measure one-way command on the MEP to view statistics about one-way proactive frame DM in the direction from the RMEP to its MEP.
- Configure two-way frame DM. Configure either two-way on-demand or proactive frame DM as follows:
  - To enable two-way on-demand frame DM, run the delay-measure two-way [ interval {1000|10000} | count count-value | exp exp-value | two-time-stamp ] ^* command.
  - To enable two-way proactive frame DM, run the delay-measure two-way proactive [ interval { 1000 | 10000 } | exp exp-value ] ^* command.