Understanding Physical Encapsulation on an Interface

Encapsulation is the process by which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the lower level frame. As a result, datagrams transmitted through a physical network have a sequence of headers: the first header for the physical network (or Data Link Layer) protocol, the second header for the Network Layer protocol (IP, for example), the third header for the Transport Layer protocol, and so on.

The following encapsulation protocols are supported on physical interfaces:

• Frame Relay Encapsulation. See Understanding Frame Relay Encapsulation on an Interface.
• Point-to-Point Protocol. See Understanding Point-to-Point Protocol.
• Point-to-Point Protocol over Ethernet. See Understanding Point-to-Point Protocol over Ethernet.
• High-Level Data Link Control. See Understanding High-Level Data Link Control.

Related Topics

• Junos OS Feature Support Reference for SRX Series and J Series Devices
• Understanding Interfaces
• Understanding Frame Relay Encapsulation on an Interface
• Understanding Point-to-Point Protocol
• Understanding High-Level Data Link Control
• Interface Encapsulations Overview in the Junos Network Interfaces Configuration Guide
• Configuring Interface Encapsulation on Physical Interfaces in the Junos Network Interfaces Configuration Guide