How to Reverting ASON Trails

After rerouting, you can revert an ASON trail to the original route or the route before rerouting, based on the reverting function that is supported by the ASON. Then follow thunder-link.com show you how to operate it.

Prerequisites

You must be an NM user with “NE operator” authority or higher.

The ASON trail must be created.

Background Information

ASON trails are classified into non-revertive ASON trails, automatically revertive ASON trails and scheduled revertive ASON trails.

For non-revertive ASON trails, you can specify whether they are restored to timeslots or ports.

For automatically revertive ASON trails, you can manually revert them to the routes before rerouting.

For scheduled revertive ASON trails, a fault of the original route is cleared after the rerouting of a service in the scheduled reversion mode, you can set scheduled revertive time to enable the service to revert at a specified time.

Services configured on revertive ASON trails (including automatically revertive ASON trails and scheduled revertive ASON trails) can be forcibly reverted to the original trail no matter whether the original trail has recovered.

NOTE:

Before the WTR or scheduled reversion time times out, a user can perform the manual revert or forced revert operation to switch services back to the original route in advance.

Procedure

For non-revertive ASON trails

1. Choose Configuration > SDH ASON > ASON Trail Management from the Main Menu.
2. Optional: Click Filter to set the filter criteria and set Whether Original Route Is Active to No. Click Filter All. A dialog box is displayed. Click Yes.
3. In the list that is displayed, select one or more ASON trails to be reverted. Click the Original Route tab to view the original routes of the ASON trails.
4. Choose Configuration > SDH ASON > TE Link Management from the Main Menu. Check whether idle resources exist on the TE link of the original route.
5. In the SDH ASON Trail Management window, click Maintenance and select Revert To Original Route > Revert to Port or Revert To Original > Revert to Timeslot. The ASON trails then revert to the routes before rerouting.
6. A dialog box is displayed. Click Yes. The Restore to Port or Restore to Timeslot dialog box is displayed indicating the operation result.
7. Click Close.

NOTE:

You can click Retry to perform the restoration again.

For automatically revertive ASON trails and scheduled revertive ASON trail

1. Choose Configuration > SDH ASON > ASON Trail Management from the Main Menu.
2. Optional: Click Filter to set the filter criteria and set Whether Original Route Is Active to No. Click Filter All. A dialog box is displayed. Click Yes.
3. In the list that is displayed, select one or more ASON trails to be reverted. Click Maintenance and choose Manual Revert or Forced Revert from the drop-down menu. The ASON trails then revert to the routes before rerouting.

NOTICE:

A forced revert operation may cause service interruption. After you start a forced revert, services are immediately reverted to the pre-rerouting trail no matter whether the trail has recovered. If the pre-routing trail has not recovered when you select Forced Revert, services are interrupted.

NOTE:

A Manual Revert operation can be performed only when services remain in the WTR state for five minutes. In other situations, the manual revert operation will be denied.

If the revertive mode is automatically revertive, you can set WTR time ( the default value is 600s ). When the original trail is restored, the service is automatically returned to the original trail after a period of time.

If the revertive mode is scheduled revertive, you can set the scheduled revertive time after the original trail is restored. Before the scheduled reversion time expires, the service is automatically returned to the original trail.