Choose Manage→Service Tunnels from the NFM-P main menu. The Manage Service Tunnels form opens.

Filter to list only the source and destination routers of the service tunnel and click Search. The list of service tunnels appears.

Double-click on a service tunnel from the list. The Tunnel (Edit) form opens.

Click on the Tests tab.

Click on the MTU Ping tab.

Click Create. The MTU Ping (Create) form opens. The form displays information about the service tunnel being tested and the originating tunnel ID.

Configure the required parameters.

Click on the Test Parameters tab and configure the required parameters.

Note: If the step size is small but the end message size is large, the amount of time to complete the MTU ping may be many minutes. Ensure that you have an appropriate step size that reflects the range of MTU packet sizes that you want to test.

Click on the Results Configuration tab and configure the required parameters.

Click Apply to save the changes.

Perform the MTU ping.

1. Click execute in the MTU Ping (Edit) form. The MTU ping diagnostic starts. A deployed test is created and run. Open the deployed test from the Deployed Tests tab to view its current state. When the test is complete, the deployed test is removed, and you can view the results. The diagnostic is complete.

2. Click on the Results tab. The list of MTU ping OAM probes sent is displayed.

3. Click on the row(s) to view diagnostic information.

4. Click Properties. The OAM results form opens.

   See To interpret OAM diagnostic test results on the STM for information about the diagnostic status messages. Use the status message to interpret the diagnostic results. For example, the status message Response Received indicates that the MTU OAM diagnostic completed successfully.

5. Close the form.

Close the Tunnel (Edit) form when the OAM diagnostics are complete.

End of steps