Specifications

Configuring the 12E/2FE Interfaces 6-11

Checking the Configuration

Use the no full-duplex command to return the interface to autosensing and autonegotiation of the

proper transmission mode with the attached device.

In the following example, half-duplex mode is conﬁgured on the same 12E/2FE interface port as in

the previous example:

Router# config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# interface fastethernet 3/0

Router(config-if)# half-duplex

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)#

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet3/0, changed

state to up

%LINK-3-UPDOWN: Interface FastEthernet3/0, changed state to up

Router# sh interface fastethernet 3/0

FastEthernet0/0 is administratively up, line protocol is up

(display text omitted)

Half-Duplex, 100BaseTX

(display text omitted)

Use the no half-duplex command to return the interface to autosensing and autonegotiation of the

proper transmission mode with the attached device.

Note For the Cisco 7206 router shelf, the interface speciﬁed in the above examples requires a shelf

number in the format interface or show interface type shelf number/port adapter slot/interface.

Checking the Conﬁguration

After conﬁguring the new interface, use the show commands to display the status of the new

interface or all interfaces, and use the ping command to check connectivity.

Using show Commands to Verify the New Interface Status

The following steps use show commands to verify that the new interfaces are conﬁgured and

operating correctly.

Step 1 Display the system hardware conﬁguration with the show version command. Ensure that

the list includes the new interfaces.

Step 2 Display all the current port adapters and their interfaces with the show controllers

command. Verify that the new 12E/2FE port adapter appears in the correct slot.

Step 3 Specify one of the new interfaces with the show interface fastethernet (for interface port

numbers 0 and 1) or show interface ethernet (for interface port numbers 2 through 13)

slot/interface command and verify that the ﬁrst line of the display speciﬁes the interface

with the correct slot number. Also verify that the interface and line protocol are in the

correct state: up or down.

Note For the Cisco 7206 router shelf, the show interfaces command requires a shelf

number in the format show interfaces type shelf number/port adapter slot/interface.