Setting Up Synthetic Loss Measurements
- 24 Jan 2024
- 3 Minutes to read
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Setting Up Synthetic Loss Measurements
- Updated on 24 Jan 2024
- 3 Minutes to read
- Contributors
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- PDF
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Synthetic loss measurement is used to measure the frame loss ratios (near-end and far-end) between two MEPs. Measurements and calculations are performed at one end only. You have to set up the SLM instance on the unit that you want to perform and display the SLM measurements.
Note: You must set up a MEP on the remote unit; setting up an SLM instance is optional.
To set up or modify an SLM instance
Access the page SOAM ▶CFM ▶SLM ▶Configuration.
All the existing Synthetic Loss Measurement Instances are displayed.Click Add to create an SLM instance or click the SLM instance index to edit an existing SLM instance.
Complete the required fields, then click Apply.
For more information on specific parameters, refer to the following table.
Synthetic Loss Message Configuration (SOAM ▶CFM ▶SLM ▶Configuration)
| Parameter | Description |
|---|---|
| Index | The index of the SLM instance. |
| SLM Name | The name of the SLM instance. |
| MEP Index MEP idx | The index assigned to the MEP. |
| MEPID | The local Maintenance association End Point Identifier. |
| Remote MEPID R-MEPID | The remote Maintenance association End Point Identifier. |
| Priority | Priority value used in VLAN tags, if present, in the transmitted frame. |
| Interval | The time, expressed in milliseconds, at which this SLM instance issues SLM frames. Possible values are: 10 , 100, 1000 and 10000 milliseconds. Default: 1000 milliseconds |
| Enable State | The state of the SLM instance. When enabled, SLM frames are sent at the specified interval. Disabled by default. |
| Reference Period | Reference period, expressed in minutes, for the SLM instance. Range: 1–1440 minutes; default: 15 minutes. |
| Near-End Threshold | The frame loss threshold for near-end packet loss, expressed as a percentage. |
| Far-End Threshold | The frame loss threshold for far-end packet loss, expressed as a percentage. |
Deleting a Synthetic Loss Measurement Instance
CAUTION: Deleting an SLM instance will also delete all SA metrics that use this SLM instance as the metric source.
To delete a synthetic loss measurement instance
Access the page SOAM ▶CFM ▶SLM ▶Configuration.
Click the SLM instance index to delete.
Click Delete.
Viewing Synthetic Loss Measurement Results
To view synthetic loss measurement results details
Access the page SOAM ▶CFM ▶SLM ▶Results.
A summary of results for all SLM instances is displayed.Click the Index of the SLM instance for which you want to view the synthetic loss measurements.
For more information on specific parameters, refer to the following table.
SLM Results (SOAM ▶CFM ▶SLM ▶Results)
| Parameter | Description |
|---|---|
| Index | The index of the SLM instance. |
| Name | The name of the SLM instance. |
| MEP Index MEP idx | The index assigned to the MEP. |
| MEPID | The local Maintenance association End Point Identifier. |
| Remote MEPID R-MEPID | The remote Maintenance association End Point Identifier. Note: A peer MEP should have the sequence number enabled toallow a local MEP to perform CCM-based SLM measurements. |
| Priority | Priority value used in VLAN tags, if present, in the transmitted frame. |
| Period | The number of periods that have elapsed since measurement started. The previous period is indicated in Period Time. Continuous Results in the section below gives the packet loss since the last time the statistics were cleared. |
| Period Time | The time when the current period results were moved to the previous period results. |
| A Near-End Alarm | The state of the near-end SLM alarm .The state of the near-end SLM alarm . |
| A Far-End Alarm | The state of the near-end SLM alarm . |
| SLM Sent | The number of synthetic loss messages sent. |
| SLR Received | vThe number of synthetic loss replies received. |
| Remote SLM Received | The number of synthetic loss messages received by the remote MEP. |
| Near-End Packets Lost | The number of packets lost at the near end. |
| Far-End Packets Lost | The number of packets lost at the far end. |
| Near-End Pkt-Loss Ratio NE Loss % | Near-end loss ratio. The ratio of packets lost in a near-end network . |
| Far-End Pkt-Loss Ratio FE Loss % | Far-end loss ratio. The ratio of packets lost in a far-end network. |
| Number of Gaps Nbr Gaps | The total number of gaps that have been detected from the sequence of packets that were received during the interval. Note: This counter is reset to zero at the beginning of each period. |
| Largest Gap Size Largest Gap | The longest uninterrupted sequence of missing packets that was detected during the period. Expressed in packets. Note: This counter is reset to zero at the beginning of each period. |
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