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Configuring LAN Interfaces
Configuring a LAN Extender Interface
IC-48
Cisco IOS Interface Configuration Guide
Figure 4 Expanded View of Cisco 1000 Series LAN Extender Connection
Management of the LAN Extender Interface
Although there is a physical connection between the core router and the LAN Extender, what you
actually manage is a remote Ethernet LAN. Figure 5 shows the connection you are managing, which is
a LAN Extender interface connected to an Ethernet network. The virtual Ethernet connection (the serial
interface and LAN Extender) has been removed from the figure, and points A and B, which in Figure 4
were separated by the virtual Ethernet connection, are now adjacent. All LAN Extender interface
configuration tasks described in this chapter apply to the interface configuration shown in Figure 5.
Figure 5 LAN Extender Interface Connected to an Ethernet Network
Installing a LAN Extender at a Remote Site
To install a LAN Extender at a remote site, refer to the Cisco 1000 Series Hardware Installation
publication.
Discovering the MAC Address
After the LAN Extender has been installed at the remote site, you need to obtain its MAC address. Each
LAN Extender is preconfigured with a permanent (burned-in) MAC address. The address is assigned at
the factory; you cannot change it. The MAC address is printed on the LAN Extender’s packing box. (If
necessary, you can also display the MAC address with the debug ppp negotiation command.) The first
three octets of the MAC address (the vendor code) are always the hexadecimal digits 00.00.0C.
Upgrading Software for the LAN Extender
You can upgrade software for the LAN Extender on the host router with a TFTP server that is local to
the host router.
The LAN Extender and core router communicate using the Point-to-Point Protocol (PPP). Before you
can configure the LAN Extender from the core router, you must first enable PPP encapsulation on the
serial interface to which the LAN Extender is connected.
Core Router
LEX Serial
Ethernet
LAN Extender
Other
networks
Remote
LAN
Virtual Ethernet connection
S2979
A
B
Core Router
LEX Ethernet
Other
networks
Remote
LAN
S2980
AB