This chapter describes, in a general way, the operational and configuration mode commands you use when investigating interface problems on the following interfaces:
In operational mode, you monitor and troubleshoot the software, network connectivity, and the router by entering command-line interface (CLI) commands. For additional information about operational mode commands, see the JUNOS Operational Mode Command Reference.
In configuration mode, you configure the interfaces by entering configuration mode and creating a hierarchy of configuration statements. For additional information about configuring the router, see the JUNOS System Basics Configuration Guide.
