User Manual

Chapter 5
Physical and Layer 2 Interfaces
This Chapter
This chapter introduces the physical and logical interfaces available on the base
unit router and the optional interfaces available as expansion options for the
PIC bay. Topics covered are:
■ “Interfaces” on page 72
■ “Naming Interfaces” on page 73
■ “Ethernet Ports” on page 74
■ “Asynchronous Port” on page 74
■ “Synchronous Ports (AR410 only)” on page 76
■ “Switch Ports” on page 76
■ “Virtual LANs” on page 79
■ “Point to Point Protocol (PPP)” on page 80
■ “Frame Relay (AR410 only)” on page 81
■ “Integrated Services Digital Network (ISDN) (AR410 only)” on page 84
■ “Configuring ISDN (AR410 only)” on page 86
■ “Installing Port Interface Cards (PICs) (AR410 only)” on page 93
Once you have configured the Layer 2 interfaces, you can configure a Layer 3
protocol to route traffic between these interfaces. A simple network overview
showing the relationship between physical interfaces, data link protocols, and
network routing protocols is shown in Figure 13 on page 72.