Fault Symptom
Users connected to GE 1/0/0 on the board of the NE80E/40E report that the Internet is slow and severe packet loss occurs.
Fault Analysis
1. Check logs on the NE80E/40E. No exception is displayed.
2. Run the display interface gigabitethernet1/0/0 command to check the interface status. It is found that the interface and protocol are both Up and no CRC error occurs.
The maximum bandwidth of the interface is 1 Gbit/s whereas the maximum bandwidth of the optical module is 155 Mbit/s. It can be inferred that the optical module mismatches the interface, which causes severe packet loss.
Procedure
1. Replace the FE optical module with a GE optical module and insert the GE optical module into the interface. Then, users can access the Internet normally and the fault is rectified.
Summary
The mismatch between the optical module and the interface causes severe packet loss. The appearances of the FE optical module and the GE optical interface module are the same. Thus, check the parameters of the optical module carefully before inserting the optical module into the interface.
