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In the example above, a command has been issued that is unknown or ambiguous. 
 
Router(config)# router 
 % Command incomplete. 
Router(config)#

 

 
In the example above a command has been issued that is incomplete. In the following examples, various 
correct commands (using route) are displayed. 
 
Router(config)# route? 
 route-map  

Create route-map or enter route-map command mode 

 router       

Enable a routing process 

Router(config)# route

 

 
Router(config)# router ? 
  ospf   Open Shortest Path First 
  rip    Routing Information Protocol (RIP) 
Router(config)# router

 

 
Router(config)#router rip 
Router(config-rip-router)#

 

 
 

 
The CLI user interface provides a history or record of commands that you have entered. This feature is 
particularly useful for recalling long or complex commands or entries, including access lists. To recall 
commands from the history buffer, use one of the following commands: 
 

Press Ctrl-P or the up arrow 
key 

Recall commands in the history buffer, beginning with 
the most recent command. Repeat the key sequence 
to recall successively older commands. 

 Press Ctrl-N or the down arrow 
key 

Return to more recent commands in the history buffer 
after recalling commands with Ctrl-P or the up arrow 
key. Repeat the key sequence to recall successively 
more recent commands. 

While in EXEC mode, list the last several commands 
entered. 

 

 
Almost every router configuration command has an opposite no form that negates or reverses a command. 
In general, the no  form is used to disable a function that has been enabled. To re-enable a disabled 
function, or to enable a function that is disabled by default, use the command without the no keyword. For 
example, Address Resolution Protocol (ARP) is enabled by default. Specify the command no arp to disable 
the ARP table; to re-enable the ARP table, use the arp command. 
 

 
There are a variety of shortcuts and editing features enabled for the CLI command-line interface. The 
following subsections describe these features: 
 

•  Moving Around on the Command Line 

•  Completing a Partial Command Name