Cisco Systems 8540 CSR Initially Configuring Fast Ethernet Interfaces, Command Description

Chapter 4 Configuring Interfaces

About Layer 3 Switching Interfaces

Initially Configuring Fast Ethernet Interfaces

Use the following procedure to assign an IP address to the Fast Ethernet 10BaseT or 100BaseT interface of your switch router so that it can be recognized as a device on the Ethernet LAN. The Fast Ethernet interface supports 10-Mbps and 100-Mbps speeds with Cisco 10BaseT and 100BaseT routers, hubs, switches, and switch routers.

	Command	Description
Step 1
	Router(config)# interface fastethernet	Enters Ethernet interface configuration mode to
	slot/subslot/interface	configure the Fast Ethernet interfaces.
	Router(config-if)#
Step 2
	Router(config-if)# ip address ip-address	Specifies the IP address and IP subnet mask to be
	subnet-mask	assigned to the FastEthernet interface.
Step 3
	Router(config-if)# [no] speed [10 100 auto]	Configures the transmission speed for 10 or
		100 Mbps, or for autonegotiation (the default). If
		you set the speed to auto, you enable
		autonegotiation, and the switch router matches
		the speed of the partner node.
Step 4
	Router(config-if)# [no] duplex [full half auto]	Configures for full or half duplex. If you set
		duplex for auto, the switch router matches the
		duplex setting of the partner node.
Step 5
	Router(config-if)# end	Returns to privileged EXEC mode.
	Router#
Step 6
	Router# copy system:running-config	Saves your configuration changes to NVRAM.
	nvram:startup-config

Example

The following example demonstrates initially configuring a Fast Ethernet interface with an IP address and autonegotiated speed and duplex:

Router(config)# interface fastethernet 1/0/0

Router(config-if)#ip address 10.1.2.4 255.0.0.0

Router(config-if)# speed auto

Router(config-if)# duplex auto

Router(config-if)# ^Z

Router# copy system:running-config nvram:startup-config

Verifying the Ethernet Interface Configuration

To verify the settings after you have configured Gigabit Ethernet or Ethernet 10/100 BaseT operation, use the following commands:

		Command	Purpose
		show interface gigabitethernet	Displays the status and global parameters of the
		slot/subslot/interface	Gigabit Ethernet interface.
		show interface fastethernet	Displays the status and global parameters of the
		slot/subslot/interface	Fast Ethernet interface.
	Layer 3 Switching Software Feature and Configuration Guide
4-6			78-6235-04, Cisco IOS Release 12.0(10)W5(18)