JINOS primarily supports two types of command modes.
a) Operational Mode
b) Configuration Mode
a) Operational Mode: When we log in to the router and the CLI starts, we are at the top level of the CLI operational mode. In this mode, we enter the commands for
1. Controlling the CLI environment, and
2. Monitor and troubleshoot network connectivity, and
3. Initiating the Configuration Mode.
Frequently used commands in this mode include ping, show, traceroute, configure, etc.
b) Configuration Mode: We use the Configuration mode for configuring the JUNOS software by creating a hierarchy of configuration statements. We enter the configuration mode by using the command "configure" as shown below:
user@host> configure
entering configuration mode
[edit]
user@host#
In configuration mode Junos software can be configured by creating a hierarchy of configuration statements. You can do this using the CLI or by creating a text (ASCII) file that contains the statement hierarchy. (The statement hierarchy is identical in both the CLI and the text configuration file.) You can configure all properties of the JUNOS software, including interfaces, general routing information, routing protocols, and user access, as well as several system hardware properties. When you have finished entering the configuration statements, you commit them, which activates the configuration on the router.
Please check this out for CLI Configuration Mode Top-Level Commands
