Dell PowerEdge M805 - Manual (Page 92)

54 Using the CLI
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In this guide, commands are organized in two separate categories: Data Link Layer commands and
Network Layer commands. The Data Link Layer (Layer 2) describes the logical organization of data
bits transmitted on a particular medium. This layer defines the framing, addressing and
checksumming of Ethernet packets. The Network Layer (Layer 3) describes how a series of
exchanges over various data links can deliver data between any two nodes in a network. This layer
defines the addressing and routing structure of the Internet.
Commands that cause specific actions to be taken immediately by the system and do not directly
affect the system configurations are defined at the top of the command tree. For example,
commands for rebooting the system or for downloading or backing up the system configuration
files are placed at the top of the hierarchy tree.
Commands that result in configuration changes to the switch are grouped in a Configuration sub
tree.
There are levels beneath the Configuration mode for further grouping of commands. The system
prompt reflects these sub-Configuration modes.
All the parameters are provided with reasonable defaults where possible.
When starting a session, the initial mode is the User EXEC mode. Only a limited subset of
commands is available in this mode. This level is reserved for tasks that do not change the
configuration. To enter the next level, the Privileged EXEC mode, a password is required.
The Privileged EXEC mode provides access to commands that can not be executed in the User
EXEC mode and permits access to the switch Configuration mode.
The Global Configuration mode manages switch configuration on a global level. For specific
interface configurations, command modes exist at a sub-level.
Entering a <?> at the system prompt displays a list of commands available for that particular
command mode. A specific command is used to navigate from one command mode to another.
The standard order to access the modes is as follows: User EXEC mode, Privileged EXEC mode,
Global Configuration mode, and Interface Configuration and other specific configuration modes.
User EXEC Mode
After logging into the switch, the user is automatically in the User EXEC command mode unless
the user is defined as a privileged user. In general, the User EXEC commands allow the user to
perform basic tests, and list system information.
The user-level prompt consists of the switch host name followed by the angle bracket (>).
The default host name is Console unless it has been changed using the hostname command in the
Global Configuration mode.
console>