Investigate Interface Steps and Commands

This chapter describes, in a general way, the operational and configuration mode commands you use when investigating interface problems on the following interfaces:

• T1
• T3
• Asynchronous Transfer Mode (ATM) 1 and ATM 2 intelligent queuing (IQ)
• SONET
• Fast Ethernet and Gigabit Ethernet
• Channelized DS-3
• Multichannel DS-3
• Channelized OC-12
• Channelized OC-12 IQ

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 Internet Software: 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.