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This chapter provides information about the Cisco IOS XE software used to configure Cisco Catalyst 8000V. The software for Cisco Catalyst 8000V uses standard Cisco IOS XE CLI commands and conventions.
Commands are not case sensitive. You can abbreviate the commands and parameters if the abbreviations contain enough letters
to be different from any other currently available commands or parameters.
The following table lists the keyboard shortcuts for entering and editing commands.
Table 1. Keyboard Shortcuts
Keystrokes
Purpose
Ctrl-B or the LeftArrowkey
Move the cursor back by one character.
Ctrl-F orthe RightArrowkey
Move the cursor forward by one character.
Ctrl-A
Move the cursor to the beginning of the command line.
Ctrl-E
Move the cursor to the end of the command line.
EscB
Move the cursor back by one word.
EscF
Move the cursor forward by one word.
The history buffer stores the last 10 commands you entered. History substitution allows you to access these commands without
retyping them, by using special abbreviated commands.
Table 2. History Substitution Commands
Command
Purpose
Ctrl-P or the UpArrowkey
Recall commands in the history buffer beginning with the most recent command. Repeat the key sequence to recall successively
older commands.
Ctrl-N or the DownArrowkey
Return to more recent commands in the history buffer after recalling commands with Ctrl-P or the UpArrow key.
Router# showhistory
While in the EXEC mode, list the last several commands you have just entered.
The command modes available in the traditional Cisco IOS CLI are exactly the same as the command modes available in Cisco
IOS XE.
Use the CLI to access Cisco IOS XE software. Because the CLI is divided into many different modes, the commands available
to you at any given time depend on the mode that you are currently in. Entering a question mark (?) at the CLI prompt allows you to obtain a list of commands available for each command mode.
When you log in to the CLI, you are in the user EXEC mode. The user EXEC mode contains only a limited subset of commands.
To have the access to all the commands, enter the privileged EXEC mode normally by using a password. From the privileged EXEC
mode, you can issue any EXEC command - user or privileged mode - or you can enter the global configuration mode.
Most EXEC commands are one-time commands. For example, show commands show important status information and clear commands clear counters or interfaces. The EXEC commands are not saved when the software reboots.
Configuration modes allow you to make changes to the running configuration. If you later save the running configuration to
the startup configuration, these changed commands are stored when the software is rebooted. To enter specific configuration
modes, you must start at the global configuration mode. From the global configuration mode, you can enter the interface configuration
mode and a variety of other modes such as protocol-specific modes.
The following table describes how to access and exit various common command modes of the Cisco IOS XE software. It also shows
examples of the prompts displayed for each mode.
Table 3. Accessing and Exiting Command Modes
Command Mode
Access Method
Prompt
Exit Method
User EXEC
Log in.
Router>
Use the logout command.
Privileged EXEC
From the user EXEC mode, use the enable EXEC command.
Router#
To return to the user EXEC mode, use the disable command.
Global configuration
From the privileged EXEC mode, use theconfigureterminalprivileged EXEC command.
Router(config)#
To return to the privileged EXEC mode from global configuration mode, use the exit or end command.
Interface configuration
From the global configuration mode, specify an interface using an interface command.
Router(config-if)#
To return to the global configuration mode, use the exit command.
To return to the privileged EXEC mode, use the end command.
Entering a question mark (?) at the CLI prompt displays a list of commands available for each command mode. You can also get a list of keywords and arguments
associated with any command by using the context-sensitive help feature.
To view the help specific to a command mode, a command, a keyword, or an argument, use one of the commands listed in the following
table.
Table 4. Help Commands and Purpose
Command
Purpose
help
Provides a brief description of the help system in any command mode.
abbreviated-command-entry?
Provides a list of commands that begin with a particular character string. (No space between command and question mark.)
abbreviated-command-entry<Tab>
Completes a partial command name.
?
Lists all the commands available for a particular command mode.
command?
Lists the keywords or arguments that you must enter next on the command line. Enter space between command and question mark.
NVRAM File Security
Cisco Catalyst 8000V allows you to encrypt some of the disk partitions internal to the VM to provide extra security around sensitive data that
may be stored on the routers. For example, information in the NVRAM is encrypted so that it is not visible to administrative
entities with access to the physical hard disk upon which Cisco Catalyst 8000V is stored.
You can search and filter the output of show and more commands. This functionality is useful if you need to sort through large amounts of output or if you want to exclude output
that you need not see.
To use this functionality, enter a show or more command followed by the “pipe” character ( | ); one of the keywords begin, include, or exclude; and a regular expression on which you want to search or filter (the expression is case sensitive):
show command | {append | begin | exclude|include | redirect | section | tee} regular-expression
The output matches certain lines of information in the configuration file.
To power off a Cisco Catalyst 8000V instance, you must power off the VM upon which the router is installed. For information about powering off the VM, see your
VM vendor documentation.
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