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Configuring LAN Interfaces

Configuring a LAN Extender Interface

IC-47

Cisco IOS Interface Configuration Guide

Configuring a LAN Extender Interface

The Cisco 1001 and Cisco 1002 LAN Extenders are two-port chassis that connect a remote Ethernet

LAN to a core router at a central site (see Figure 3). The LAN Extender is intended for small networks

at remote sites. Overview information for LAN extender interfaces is provided in these sections:

• Connecting a LAN Extender to a Core Router

• Installing a LAN Extender at a Remote Site

• Discovering the MAC Address

• Upgrading Software for the LAN Extender

• Configuring the LAN Extender

For examples of LAN Extender interface configuration tasks, see the “LAN Extender Interface

Configuration Task List” section.

Connecting a LAN Extender to a Core Router

The remote site can have one Ethernet network. The core router can be a Cisco 2500 series, Cisco 4000

series, Cisco 4500 series, Cisco 4700 series, Cisco 7500 series, or AGS+ router running Cisco IOS

Release 10.2(2) and later, which support the LAN Extender host software.

Figure 3 shows the connection between the LAN Extender and the core router via a short leased serial

line, typically a 56-kbps or 64-kbps line. However, the connection can also be via T1 or E1 lines.

Figure 3 Cisco 1000 Series LAN Extender Connection to a Core Router

Expanded View of the Connection to a Core Router

Figure 4 is an expanded view of Figure 3 that shows all the components of the LAN Extender connection

to a core router. On the left is the core router, which is connected to the LAN Extender as well as to other

networks. In the core router, you configure a LAN Extender interface, which is a logical interface that

connects the core router to the LAN Extender chassis. In the core router, you also configure a serial

interface, which is the physical interface that connects the core router to the LAN Extender. You then

bind, or associate, the LAN Extender interface to the physical serial interface.

Figure 4 shows the actual physical connection between the core router and the LAN Extender. The serial

interface on the core router is connected by a leased serial line to a serial port on the LAN Extender. This

creates a virtual Ethernet connection, which is analogous to having inserted an Ethernet interface

processor into the core router.

S2921

LAN Extender

Remote

LAN

Other

networks

Core router

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