About Interfaces

Interfaces can be can be permanent or transient, and are used for networking or services:

• Permanent interfaces—Interfaces that are always present in the routing platform.
• Transient interfaces—Interfaces that can be inserted into or removed from the routing platform depending on your network configuration needs.
• Networking interfaces—Interfaces, such as Ethernet or SONET interfaces, that primarily provide traffic connectivity.
• Services interfaces—Interfaces that provide specific capabilities for manipulating traffic before it is delivered to its destination.

For an overview of interfaces, supported interface types, interface descriptors, interface naming, displaying interface configurations, and interface and router clock sources, see the JUNOS Internet Software Network Interfaces and Class of Service Configuration Guide.

For an overview of the command-line interface (CLI) used to configure the JUNOS software and monitor the router operation, including the CLI command hierarchy, using the CLI, controlling the CLI environment, displaying the CLI command history, and a summary of CLI operational and environmental commands, see the JUNOS Internet Software Protocols, Class of Service, Chassis, and Management Command Reference.

For an overview of operational mode commands for router interfaces, see Interfaces Operational Mode Commands Overview.