The GE Port on the Client Side Reports LINK_DOWN Alarm

Due to the auto negotiation, the GE port reports LINK_DOWN alarm when FDG connects to a GE port of Cisco 12410 router on the client side.

Product

OptiX BWS 1600G, Huawei OSN3500, Huawei MA5683T,Huawei MA5608T

Fault Type

Service interruption

Equipment Interconnection

Client Equipment

LINK_DOWN

Symptom

In one DWDM network, two type of GE services are transmitted over wavelengths, which are generated by the FDG board. When the FDG connects to Cisco Router 12410, the GE port on the router reports LINK_DOWN alarm.

Cause Analysis

This problem occurs because the FDG board is improperly connected to the client-side device or the fiber between them is damaged. If auto-negotiation function is required when the FDG connects to the client-side device, this problem also occurs.

Procedure

1. Check the fiber that connects the client-side port on the FDG to the router.
2. Check the input optical power on the T2000. The input optical power is found normal.
3. Use the optical power meter to check the output optical power of the client-side device. The output optical power is found normal.
4. If Cisco router still reports LINK_DOWN. Perform the following setting:
   1. In the NE Explorer, select the desired FDG board and choose Configuration > WDM Interface from the Function Tree.
   2. Select By Board/Port(Channel).
   3. Select Channel from the drop-down list.
   4. Adjust the Auto Negotiation as Enabled in the Basic Attributes tab and click Apply.
5. Confirm that the port on Cisco router reports LINK_UP.

Reference Information

None.

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