How Do I Troubleshoot a Network Router?

Network diagnosis is a comprehensive technology that involves all aspects of network technology. Router failure is the most common problem. First look at the diagnostic modes, and then briefly review the basic concepts of networks and routers.

Router troubleshooting and troubleshooting

The EIA signal and network status output by the show line command: noCTS noDSR DTR RTS: The modem is not connected to the asynchronous interface. CTS noDSR DTR RTS: The modem is connected to the asynchronous interface normally, but the remote modem is not connected. CTS DSR DTR RTS: The remote modem dials in and establishes a connection. Generally, the following steps can be used to determine the failure of the asynchronous communication port: check the cable line quality; check the parameter settings of the modem; check the connection speed of the modem; check whether the rxspeed and txspeed match the configuration of the modem; check the port's Communication status; check EIA status display from report of show line command; check interface encapsulation; check packet loss and buffer loss. Conclusion Network failure is inevitable. After the network is built and running, network fault diagnosis is an important technical work for network management.

To do a good job of network operation management and fault diagnosis, to improve the level of fault diagnosis needs to pay attention to the following issues: carefully study the network technology theory; clear network structure design, including network topology, equipment connection, system parameter settings and software use ; Understand the normal operating status of the network, pay attention to collecting various statuses and report output parameters during normal operation of the network; Familiar with common diagnostic tools, and accurately describe the failure phenomenon.