3Com 10014299 manual Test Tool of Network Connection, Ping command

86CHAPTER 6: DISPLAY AND DEBUGGING TOOLS

Two switches control the output of the debugging information:

■Debugging switch, which controls whether to test a certain function/module/protocol.

■Syslog output direction switch, which controls outputting the debugging information to the control console, Telnet terminal or internal buffer or log host.

The following is part of the common debugging commands. For more specific debugging commands related to various protocols, please see related chapters in this manual and the 3Com Router Command Reference Guide.

The 3Com Router provides a shortcut Ctrl+D to close the huge amount of debugging information output by the terminal, which functions the same as the command undo debugging all.

Examples are omitted here. Please see relevant chapters in the 3Com Router

Command Reference Guide.

In addition, when any terminal user enables or disables the debugging, the debugging information output on other user terminals will be affected.

As for all link layer protocols, the debugging can be controlled according to interfaces, so that the interference of a huge amount of redundant information can be avoided effectively and it makes troubleshooting more convenient.

On the 3Com Router, Syslog (log system) manages the output of debugging information and other prompt information. Before obtaining the debugging information, you need to open the related Syslog switch. Firstly, you must use the info-center enable command to enable Syslog function, then you can use the info-center console or info-center monitor command to enable debugging according to the different type of terminal, or use the info-center console debugging command on the Console terminal, or use info-center monitor debugging on the telnet terminal or dumb terminal. Refer to subsequent sections for introduction and detailed descriptions and commands of Syslog.

Since the output of the debugging information will affect the running efficiency of the router, please do not turn on any debugging switches unless necessary, especially the debugging all command. After completing debugging, please turn off all debugging switches.

Test Tool of Network

Connection

Ping Command The ping command is mainly used to check the connection of the network, i.e. whether the host is accessible. Ping sends Internet Control Message Packets (ICMP) echo packets to another computer connected on the network to see whether it echoes back. Ping is a useful command to test the connectivity of the network and details about the journey.

Table 65 ping command

Operation

Command