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Configuring Gigabit Ethernet Enhanced High-Speed WAN Interface Cards
OL-24318-02
Configuring Loopback
DETAILED STEPS
Configuring Loopback
Use the loopback command in interface configuration mode to configure loopback. The
EHWIC 1 GE-SFP-CU supports MAC layer loopback and driver type loopback. The MAC loopback is
used to detect MAC failure. The driver loopback is used to detect transceiver failure. Use the show
interface to see the loopback mode and check if the hardware is functional.
Command or Action Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
interface type slot/subslot/port number
Example:
Router(config)# interface ethernet
0/3/0
Enters the configuration mode for
Ethernet transport on the EHWIC
interface on the router.
Step 4
ip address ip-address mask
Example:
Router(config-if)# ip address
192.168.12.2 255.255.255.0
Sets the IP address and subnet mask for
the interface.
Step 5
shutdown
Example:
Router(config-if)# shutdown
Disables the interface, changing its state
from administratively up to
administratively down.
Step 6
no shutdown
Example:
Router(config-if)# no shutdown
Enables the interface, changing its state
from administratively down to
administratively up.
Step 7
exit
Example:
Router(config-if)# exit
Router(config)#
Exits configuration mode and returns to
global configuration mode.