In an office, two pieces of OptiX 155/622H are used. An ET1D board is inserted in slot 3 of the 155/622H. The two ET1D boards are connected to the two path rings formed by the OptiX 2500+. The two path rings are interconnected through 2M trunk cables instead of optical fibers in the central office. Deploy point-to-point Ethernet services through the two pieces of 155/622H, and connect a lap-top PC to each 155/622H. The lap-top PCs cannot ping each other. The MAC address of the peer lap-top PC, however, can be queried with the arp -a command.
1. Carefully check the service configuration data. The service configuration data is correct. For instance, you can reconfigure the SDH service data or the data about the 2M trunk cables bound to the Ethernet.
2. Check the Ethernet port attributes. The attributes are correct. The attribute of the internal ports is TAG, and that of the external ports is ACCESS.
3. Replace the network cables connecting the lap-top PCs. The fault persists. Therefore, the network cables are normal.
4. Replace the lap-top PCs, and run the arp -a command. The MAC addresses of the lap-top PCs change, indicating that the lap-top PCs are normal.
5. Originally five 2M trunk cables are bound. Rebind the 2M trunk cables one by one to the ports, and then perform a ping test. The fourth 2M trunk cable cannot be pinged. Check the 2M interconnection of the central office. A dry solder joint is detected at one end of the 2M trunk cable and thus the connectivity of the 2M cable is unstable. Rectify the 2M cable connector and then connect the 2M trunk cable. The fault is removed.
Possible causes of the Ethernet service failure:
1. Service configuration errors, such as incorrect SDH service configuration or incorrect configuration of the 2M trunk cables bound to the Ethernet
2. Ethernet port attribute errors, such as attribute errors of the internal or external ports
3. Network cable faults
4. Lap-top PC faults
5. Fault of the 2M cable interconnection in the central office
If Ethernet services are interconnected through 2M trunk cables, improper connection of the 2M interconnection cables may cause Ethernet service failure or packet loss.