Procedure 16-4.8: OAM PM on-demand delay measurement
Overview
Use this procedure to perform an on-demand one-way or round-trip delay measurement for a selected MEP.
On-Demand DM has the same restrictions on instances as Proactive DM including not sharing an instance with a Proactive session. See Procedure 16-4.6: OAM PM proactive delay measurement (DM).
When remote “mc” is configured, the class 1 multicast address for the MEP’s level is used. This is useful in a network where the peer MEP's address isn't known or may change, however care must be taken that only one MEP will respond.
A single measurement is made for an On-Demand session, which can be deferred using a start time. The measurement consists of a pair of Loss Measurement Messages (LMM) and the received Loss Measurement Replies (LMR) from which the count differences gives the number of frames sent and received during the period between them.
The following results are retrievable using the show on-demand-dm-stats CLI command or the Web GUI ServiceOAM → Delay Measurement → On-Demand Status command:
Before you begin
Refer to the following restrictions:
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Ethernet OAM pm (ethoam pm) must be enabled. See Procedure 16-4.1: Enable Ethernet OAM Performance Monitoring (PM).
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On-demand DM can be configured on only one Up-MEP for a particular VID, MD level, and priority, and on only one Down-MEP for a particular VID, MD level, priority and port (and only on a port which has ethoam pm enabled).
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You cannot configure a proactive or on-demand DM session on both an Up and Down MEP having the same VID, MD level, and priority.
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On-demand DM is not available for MEPs with no VLAN (VID = 0).
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A DM responder may be configured simultaneously with either proactive or on-demand DM, but it must be on the same MEP.
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The command is rejected if remoteMEPID is specified, but the remote MEP MAC address is not known (CCM are not received from the remote MEP).
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A configured responder is necessary to support a remote DM session (Proactive or On-Demand) when there is not a DM session for the same VLAN, CoS and MD level (and port, for a Down-MEP) enabled on the MEP.
Step
1 |
From the Navigation menu, select Service OA&M → Delay Measurement → On-Demand Configuration to configure an on-demand delay measurement. Equivalent CLI command: ethoam on-demand-dm Result: The On-Demand DM Configuration window displays current settings. |
2 |
Enter the parameters as required. See On-demand delay measurement parameters. Click Submit to execute the command. Click Delete to delete the selected on-demand DM session. |
3 |
From the Navigation menu, select ServiceOA&M → Delay Measurement → On-Demand Status command to retrieve the results of the measurement. Equivalent CLI command: show ethoam on-demand-dm-stats. End of steps |
On-demand delay measurement parameters
|
Parameter |
Description |
CLI command |
|---|---|---|
|
MD Name |
Select the MD name from the drop-down list containing all MDs on the bridge. |
ethoam on-demand-dm md <MDname> |
|
MA Name |
Select the MA name from the drop-down list containing all MAs on the bridge. The drop-down list contains all MAs, which do NOT have their CCM Interval set under 1 second, in the selected MD. |
ethoam on-demand-dm ma <MAname> |
|
Source MEPID |
MEPID of the MEP transmitting proactive DM. |
ethoam on-demand-dm mep <sourceMEPID> |
|
Priority |
The priority of the DMM frames carrying the DM information,, and the Class of Service being measured. Valid values: an integer in the range of 0 to 7. |
ethoam on-demand-dm priority <priority-value> |
|
Remote MEP |
MAC Address or MEPID of the remote MEP. Valid values: |
ethoam on-demand-dm remote {<remoteMAC> | <remoteMEPID> | mc} |
|
DMM Frame Number |
The number of DMM frames (delay measurements) sent. The valid value in this release is 1. |
ethoam on-demand-dm nbr <meas-nbr> |
|
Start Time |
The time to start a measurement. The valid values: an integer in the format of YYYYMMDDHHMMSS. The Start Time must be later than the current time. |
ethoam on-demand-dm start-time <s-time> |
|
Frame Size |
The size of the on-demand DM frame. Valid values: 0 or an integer in the range of 64 to 9216. This is an optional field. 0 means a random frame size distributed between 64 and the port’s configured mtu size. |
ethoam on-demand-dm frame_size <fs-value> |