1. Perform a local loopback test. The test finds no packet loss or bit error. This indicates that the USG device is normal.
2. Change the duplex mode and rate of the GE interface of the USG5300 for multiple times. When both the duplex mode and rate are negotiation, the interface state is automatically negotiated to 100M/FULL state.
3. Run the reset counters interface command to clear the counts. Then view the Internet interface information of the USG5300. No error bit is generated, and the user Internet access speed becomes normal.
1. Check the Internet interface configuration on the USG5300. The interface rate is 100M, and the duplex mode is negotiation. The configuration complies with the customer's requirements.
2. Run the display interface command to view the interface statistic information, and find that the duplex mode changes to harf-duplex and that the interface generates a lot of error bits. Manually change the duplex mode to full-duplex. The number of error bits is still increasing. So, it is suspected that the USG5300 device is defective or that the fault is caused by a compatibility problem.