Helps you troubleshooting lower order service Deviating on OSN3500 from tunnel

On an automatically switched optical network (ASON), the actual cross-connections of lower order services on tunnels may be inconsistent with the ports on the ASON tunnels due to service rerouting, loss of route optimization information, faulty OSN3500 databases, or abnormal resets of the system control and communication board. That is, lower order services deviate from tunnels. On the U2000, you can perform the “Lower Order E2E Service Management” operation to quickly restore services.

Fault Symptoms

A large number of discrete cross-connections exist on the U2000.

NOTE:

If lower order ASON services deviate from the channel of the ASON server trail, the cross-connections of such lower order ASON services are discrete cross-connections.

Impact on System

After deviating from tunnels, lower order services are interrupted.

Possible Causes

Cause 1: In the service rerouting or optimization process, service data is lost and the ASON system fails to receive a response.

Cause 2: A fault occurs in the databases of an NE.

Cause 3: The system control board is reset abnormally.

Tools, Equipment, and Materials

U2000

Prerequisites

After creating lower order services by means of trail configuration or per-NE configuration, you must back up original trail data on the NMS. When a service is faulty, the system compares its original trail data and current trail data and analyzes whether the service has discrete cross-connections. If discrete cross-connections exist, service configurations are automatically rectified. You can complete the following steps to back up trail data.

1.     Choose Configuration > SDH ASON > Lower Order E2E Service Management from the Main Menu. The Lower Order E2E Service Repair window is displayed.

2.     Click Data Backup. The Confirm dialog box is displayed.

3.     Verify that backup conditions are met and click Yes.

Procedure

1.     Choose Configuration > SDH ASON > Lower Order E2E Service Management from the Main Menu. Then, the Lower Order E2E Service Repair window is displayed.

2.     Click Analyze. Then, the Filter dialog box is displayed.

3.     Set Trail Name, Source NE, Sink NE, and Passed NE. Then, click Filter.

4.     The lower order services that meet the filter conditions are displayed in Lower Order E2E Service.

5.     Select the service to be repaired and click Repair. Then, the end-to-end ASON server trail that the service follows is displayed in ASON Server Trail.

NOTE:

The system can repair multiple services at one time. If multiple services are selected to be repaired, only the ASON service-layer information of the first service will be displayed in Lower Order E2E Service Repair.

6.     After the service is repaired, the repair result is displayed in Repair Status of Lower Order E2E Service.

NOTE:

The system automatically performs the following operations to repair end-to-end lower order services.

7.     View alarms on the U2000 to check whether the CP_SRV_INT alarm is cleared.

8.     In the NE Explorer, choose Configuration > SDH/PDH Service Management. Click Query. NE-side service data is displayed and refreshed.

9.     In the Result dialog box, click Close.

10.   Choose Service > SDH Trail > Search for SDH Trail from the Main Menu. Search for trails.

11.   Wait until trail data is displayed (Waiting time varies with service quantity). If no discrete services are contained in trail data, the fault no longer exists. If discrete services are contained in trail data, contact Huawei engineers.

Related Information

None.