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Identifying the Symptoms of a Broken Network Connection



The symptoms of a problem in your network are usually quite obvious, such as the failure to reach a remote host.


To identify the symptoms of a problem on your network, start at one end of your network and follow the routes to the other end, entering all or one of the following Junos OS command-line interfaces (CLI) operational mode commands:

Sample Output


The sample output shows an unsuccessful ping command in which the packets are being rejected because the time to live is exceeded. The output for the show route command shows the interface ( that you can examine further for possible problems. The traceroute command shows the loop between (R2) and (R6), as indicated by the continuous repetition of the two interface addresses.