Specifications

Input/Output Controller Replacement Instructions 37

Troubleshooting Using the show interfaces fastethernet Command

Note Use the no full-duplex command to return the Fast Ethernet port on the I/O

controller to half-duplex mode.

Step 6 Change the shutdown state to up and return to conﬁguration mode to enable the interface

as follows:

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)#

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed

state to up

%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Step 7 Press Ctrl-Z (hold down the Control key while you press Z) or enter end to exit

conﬁguration mode and return to the EXEC command interpreter prompt as follows:

Router(config)#

Ctrl-Z

Router#

Step 8 Write the new conﬁguration to nonvolatile memory as follows:

Router# copy running-config startup-config

[OK]

Router#

Step 9 Use the show interfaces command to verify that the interface and line protocol are in the

correct state (up) and the correct media type (MII or RJ-45) and transmission mode

(half-duplex or full-duplex) are conﬁgured on the interface. The following example

shows the I/O controller’s Fast Ethernet interface and line protocol are up, the media type

is RJ-45 (shown below as 100BaseTX), and the transmission mode is full-duplex (shown

below as fdx):

Router# sh interface fastethernet 0/0

FastEthernet0/0 is administratively up, line protocol is up

(display text omitted)

Encapsulation ARPA, loopback not set, keepalive not set, fdx, 100BaseTX

(display text omitted)

Note In a Cisco 7206 router shelf, the interface speciﬁed in this step would include a

shelf number.

This completes the procedure for a basic conﬁguration of the Fast Ethernet port on the I/O controller.

Troubleshooting Using the show interfaces fastethernet Command

Intel Corporation recently changed the speciﬁcations for its Peripheral Component Interconnect

(PCI) Fast Ethernet hardware interface. These changes have been incorporated into certain Cisco

hardware products. For most users, this change is transparent. However, an anomaly has been

identiﬁed when this updated Cisco hardware is used in conjunction with certain releases of Cisco

IOS software. This section explains the anomaly and how to work around it.