Use this procedure to configure loopback interfaces. This task helps you complete the required configuration, verification, or management action in Cisco Optical Site Manager.
A loopback is a logical interface that enables testing of network ports and circuits. This helps to identify and isolate faults before live traffic is transmitted.
Loopbacks facilitate troubleshooting by confirming the operational status of interfaces, cabling, and device components. This improves network reliability and performance.
This feature is not supported for the FX-MXP card mode of the OTN-XP card.
Loopbacks test and diagnose network interfaces by routing traffic back to the source. They isolate faults in line cards or optical paths by verifying signal integrity and device programming.
This task is traffic-affecting.
Before you begin
-
Configure loopback only when the card is in maintenance service state. If you need to place trunk ports in a locked maintenance state, see Provision optical channels.
Follow these steps to configure loopback on the card.
Procedure
-
Click the Maintenance tab.
-
Click the Loopback section to expand it.
-
From the Loopback Type drop-down list, select any of these options for each port required:
- Terminal
- Facility
- Terminal-Drop
- Facility-Drop
-
Select the admin state from the Admin State drop-down list.
-
Click Apply.
The selected port transmits traffic, which is looped back either internally or at the line interface. This setup allows you to verify signal flow and detect errors such as loss of signal or CRC errors. Loopback states are maintained in the maintenance administrative state. You can verify these states using show commands.