Cisco Systems OL-6426-02 Benutzerhandbuch

The Cisco 1811 and Cisco 1812 routers each have two Fast Ethernet interfaces for WAN connection. The 
Cisco 1801, Cisco 1802, and Cisco 1803 routers each have one ATM interface for WAN connection.

Based on the router model you have, configure the WAN interface(s) using one of the following 
procedures:

This procedure applies only to the Cisco 1811 and Cisco 1812 router models. Perform these steps to 
configure the Fast Ethernet interfaces, beginning in global configuration mode.

Repeat these steps for the other Fast Ethernet WAN interface if desired.

Due to a limitation on the internal transceiver of the on-board layer-3 Fast Ethernet interfaces available 
on Cisco 1812 Ethernet Access Routers, configuring the interface with a speed of 10 Mbps may cause 
some CRC errors to appear on the interface. This is an expected behavior of the Cisco 1812 routers 
on-board layer-3 Fast Ethernet interface.

interface type number

Router(config)#interface fastethernet 0

Router(config-int)# 

Enters the configuration mode for a Fast 
Ethernet WAN interface on the router.

Fast Ethernet WAN ports are numbered 
0–1 on the Cisco 1800 series routers.

ip address ip-address mask

Router(config-int)# ip address 192.1.12.2 

Router(config-int)# 

Sets the IP address and subnet mask for the 
specified Fast Ethernet interface.

Router(config-int)# no shutdown

Router(config-int)# 

Enables the Ethernet interface, changing its 
state from administratively down to 
administratively up.

Router(config-int)# exit

Router(config)# 

Exits interface configuration mode and returns 
to global configuration mode.