Hello,
1. Back up NE data before swapping, as described in Malik3000.
2. Back up the current alarms of NEs on the U2000 and compare the alarms after the migration. If there are new alarms, handle them in a timely manner.
3. Perform a protection switching test before the operation to ensure that the services transferred from this site can be switched to other routes.
4. If the NE is a gateway NE, it is recommended that the NMS be connected to the standby gateway NE.
Thanks!