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Configuring Basic Parameters
Configure Fast Ethernet LAN Interfaces
The Fast Ethernet LAN interfaces on your router are automatically configured as part of the default
VLAN and as such, they are not configured with individual addresses. Access is afforded through the
VLAN. You may assign the interfaces to other VLANs if desired. For more information about creating
VLANs, see
Configure WAN Interfaces
The Cisco 851 and Cisco 871 routers each have one Fast Ethernet interface for WAN connection. The
Cisco 857, Cisco 877, and Cisco 878 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:
•
•
Configure the Fast Ethernet WAN Interface
This procedure applies only to the Cisco 851 and Cisco 871 router models. Perform these steps to
configure the Fast Ethernet interface, beginning in global configuration mode:
Command
Step 1
interface type number
Example:
Router(config)# interface fastethernet 4
Router(config-int)#
Step 2
ip address ip-address mask
Example:
Router(config-int)# ip address 192.168.12.2
255.255.255.0
Router(config-int)#
Step 3
no shutdown
Example:
Router(config-int)# no shutdown
Router(config-int)#
Step 4
exit
Example:
Router(config-int)# exit
Router(config)#
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
1-6
Chapter 5, "Configuring a LAN with DHCP and VLANs."
Configure the Fast Ethernet WAN Interface
Configure the ATM WAN Interface
Chapter 1
Basic Router Configuration
Purpose
Enters the configuration mode for a Fast
Ethernet WAN interface on the router.
Sets the IP address and subnet mask for the
specified Fast Ethernet interface.
Enables the Ethernet interface, changing its
state from administratively down to
administratively up.
Exits configuration mode for the Fast Ethernet
interface and returns to global configuration
mode.
OL-5332-01
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Troubleshooting
