Cisco Systems IC-23 manual Configuring the LAN Extender, IC-49

Configuring LAN Interfaces

Configuring a LAN Extender Interface

Configuring the LAN Extender

You configure the LAN Extender from the core router—either a Cisco 4000 series or Cisco 7000 series router—as if it were simply a network interface board. The LAN Extender cannot be managed or configured from the remote Ethernet LAN or via a Telnet session.

To configure the LAN Extender, you configure a logical LAN Extender interface on the core router and assign the MAC address from your LAN Extender to that interface. Subsequently, during the PPP negotiation on the serial line, the LAN Extender sends its preconfigured MAC address to the core router. The core router then searches for an available (preconfigured) LAN Extender interface, seeking one to which you have already assigned that MAC address. If the core router finds a match, it binds, or associates, that LAN Extender interface to the serial line on which that MAC address was negotiated. At this point, the LAN Extender interface is created and is operational. If the MAC address does not match one that is configured, the connection request is rejected. Figure 6 illustrates this binding process.

Figure 6 Binding a Serial Line to a LAN Extender Interface

S1
S0	S2			LAN Extender
Core router				MAC Address
Serial			00.00.0c.01.00.05
	Available LAN		MAC
Interface	Extender Interfaces		Address
S0	0	00.00.0c.00.00.01
S1	1	00.00.0c.00.01.03
S2	2	00.00.0c.01.00.05
S1			PPP
			negotiation
1.)
S0	S2			LAN Extender
Core router

2.)

My MAC address 00.00.0c.01.00.05

00.00.0c.01.00.05 corresponds to

3.) LAN Extender interface 2 on serial interface 2

S1

4.)

S0S2

Core router

S2922

LAN Extender

LAN Extender interface 2, and hence LAN extender is bound to serial interface 2

Cisco IOS Interface Configuration Guide

IC-49