Dell PowerEdge M420, Справочное руководство

Страница: 172 / 1682

172
Using the CLI
1 default Po1-48, Default
Gi1/0/1-24
Example #3
CLI Command Modes
Since the set of CLI commands is very large, the CLI is structured as a
command-tree hierarchy, where related command sets are assigned to
command modes for easier access. At each level, only the commands related
to that level are available to the user and only those commands are shown in
the context sensitive help for that level.
In this guide, commands are organized into three categories:
• Layer 2 (Data Link Layer) commands
• Layer 3 (Network Layer) commands
• Utility Commands
Layer 2 (Data Link Layer) describes the logical organization of data bits
transmitted on a particular medium. This layer defines the framing,
addressing and checksumming of Ethernet packets.
Layer 3 (Network Layer) 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.
Utility describes commands used to manage the switch.
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.
2CSPC4.XModular-SWUM200.book Page 172 Thursday, March 10, 2011 11:18 AM