INS_CNGE3FE8MS[POE][HO] Rev. 11.7.17 PAGE 269
INSTRUCTION MANUAL CNGE3FE8MS[POE][HO]
TECH SUPPORT: 1.888.678.9427
page 15).
The initial mode is determined by the privilege level of the user logging in. If the privilege level is
zero or one the user is unprivileged and begins in the (Unprivileged) Exec mode. If the privilege
level is higher, the session begins in Privileged Exec mode.
A user can raise the Exec mode privilege level to a higher value if an enable password has been
configured for that level. This elevation is done with the enable level command, where level is a
value between 1 and 15. The reverse operation (lowering the privilege level) is achieved with the
disable command.
Once in Privileged Exec mode, it is possible to enter into the global configuration mode by
entering the command configure terminal. Exit from global configuration is achieved by typing
end or exit and then pressing Enter or pressing Ctrl-Z.
Access to a configuration sub-mode (for example, Ethernet interfaces) goes through global
configuration or another sub-mode. Thus, it is possible to change directly from VLAN sub-mode
to Ethernet interface sub-mode, for instance.
Thus, each mode and sub-mode implements a scope for commands. Inside each mode, a
particular subset of commands is available. To get to other commands, one must generally
change mode/sub-mode. This is necessary because there are commands with identical prefixes in
different modes. For example, there are commands that begin with ‘ip’ in Privileged Exec, global
configuration, and VLAN Interface Configuration modes.
There are two exceptions to this:
» While in a configuration sub-mode, access to global configuration mode commands is possible
as long as there is no ambiguity. Execution of a global configuration command exits the sub-
mode.
» Exec mode commands (whether privileged or unprivileged) are accessible from within global
configuration or one of the sub-modes by using the do command.
The do command takes an arbitrary command line from Exec and executes it. In the following
example, the user wants to change the IP address on the VLAN 1 interface and uses do to verify
the current address while in the sub-mode.
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