I have no idea to type some command . And then the start command is as root@xxxx_RE0:~#
If type show, router will reply me as "show : Command not found."
So, I can't use it normally. How to change back to root@xxxx_RE0> ?
Look like you're in shell prompt. Please type cli to enter in command mode.
To add some good techpubs documentations on the same…
To log in to a router and start the CLI:
Log in as root.
The root login account has superuser privileges, with access to all commands and statements.
Start the CLI:
The > command prompt shows you are in operational mode. Later, when you enter configuration mode, the prompt will change to #.
Switching Between Junos OS CLI Operational and Configuration Modes
To login to router shell,