LDG board of Metro 6100 equipment reports the INBADOCTS_OVER alarm.
Symptom
In one DWDM network, the Metro 6100 equipment is configured with the LDG board that is interconnection with client-side datacom equipment and transmits the GE service, but during the running status, the LDG in some site reports the INBADOCTS_OVER alarm. The alarm is reported continually for several minutes.
Cause Analysis
The INBADOCTS_OVER indicates that the LDG has received the damaged IP service packet. The following lists the possible causes:
- The input optical power of the LDG board is abnormal.
- Client-side datacom equipment sent the wrong IP packet.
- The GE port on the LDG board is faulty.
- The length of the IP packet applied for exceeds the maximum length of a packet configured for the LDG port.
Procedure
- Test the LDG port input power and it is found that the power is normal.
- Use Smartbits to test the LDG board for 24 hours, and no bit errors are detected, which indicates that the problem may be caused by the datacom equipment.
- Confirm with datacom engineers and it is found that the IP packet from datacom port is longer than the default packet length value of the LDG port (1552 byte ). In NE Explorer of the T2000, select the LDG board. Then, choose to change the value of Maximum Packet Length to 1552 bytes, or change it to the maximum value. And the INBADOCTS_OVER alarm is not reported any more.
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