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Features and limitations

This topic contains information about CLI features and limitations.

The CLI has the following features and limitations:

  • Multiple concurrent CLI sessions are allowed with different access methods (Telnet or SSH). At most, two Telnet command-line sessions can be active at any time.
    Note
    The number of Telnet sessions is configurable; valid values are 0, 1, and 2. The value 0 means that the Telnet interface is disabled.
  • One command is allowed per line (160-character limit, including spaces).
  • There is no continuation character for long commands. The only editing function is the Backspace key to erase the character that you just typed.
  • The Up Arrow and Down Arrow keys can be used to browse through the last eight commands. The history command displays a list of the last eight commands, which you can then use as a shortcut to execute a command, as in the following example: 
    system > history
     0 ifconfig eth0
     1 readlog 
     2 readlog
     3 readlog
     4 history
    system > <span className="ph">!0</span>
    -state enabled
    -c dthens
    -i 192.168.70.125
    -g 0.0.0.0
    -s 255.255.255.0
    -n IMM2A00096B9E003A
    -r auto
    -d auto
    -m 1500
    -b 00:09:6B:9E:00:3A
    -l 00:00:00:00:00:00
    system >
  • In the CLI, the output buffer limit is 2 KB. There is no buffering. The output of an individual command cannot exceed 2048 characters. This limit does not apply in serial redirect mode (the data is buffered during serial redirect).
  • The output of a command is displayed on the screen after the command has completed execution. This makes it impossible for commands to report real-time execution status. For example, in the verbose mode of the flashing command, the flashing progress is not shown in real time. It is shown after the command completes execution.
  • Simple text messages are used to denote command execution status, as in the following example: 
    system> power on
    ok
    system> power state
    Power: On
    State: System power off/State unknown
    system>
  • The command syntax is case sensitive.
  • There must be at least one space between an option and its argument. For example, ifconfig eth0 -i192.168.70.133 is incorrect syntax. The correct syntax is ifconfig eth0 -i 192.168.70.133.
  • All commands have the -h, -help, and ? options, which give syntax help. All of the following examples will give the same result: 
    system> power -h
    system> power -help
    system> power ?
  • Some of the commands that are described in the following sections might not be available for your system configuration. To see a list of the commands that are supported by your configuration, use the help or ? option, as shown in the following examples: 
    system> help
    system> ?
  • In a Flex System, some settings are managed by the CMM and cannot be modified on the IMM2.