routing is enabled by default. To disable IP routing, enter the no ip routing command
and enter ip routing to re-enable it.
1.2 Getting Help
In any command mode, you can get a list of available commands by entering a question
mark (?).
Router>?
To obtain a list of command that begin with a particular character sequence, type in
those characters followed immediately by the question mark (?).
Router#co?
Configure connect copy
To list keywords or arguments, enter a question mark in place of a keyword or
argument. Include a space before the question mark.
Router#configure ?
memory
Configure from NV memory
network
Configure from a TFTP network host
terminal
Configure from the terminal
You can also abbreviate commands and keywords by entering just enough characters to
make the command unique from other commands. For example, you can abbreviate the
show command to sh.
1.3 Configuration Files
Any time you make changes to the router configuration, you must save the changes to
memory because if you do not they will be lost if there is a system reload or power
outage. There are two types of configuration files: the running (current operating)
configuration and the startup configuration, which is loaded up in rebooting a router.
Use the following privileged mode commands to work with configuration files.
configure terminal – modify the running configuration manually from the
terminal.
show running-config – display the running configuration.
show startup-config – display the startup configuration.
copy running-config startup-config – copy the running configuration to the
startup configuration.
copy startup-config running-config – copy the startup configuration to the
running configuration.
erase startup-config – erase the startup-configuration in NVRAM.
copy tftp running-config – load a configuration file stored on a Trivial File
Transfer Protocol (TFTP) server into the running configuration.
copy running-config tftp – store the running configuration on a TFTP server.
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