Cisco 10000 Series Configuration Manual page 255

Chapter 11 1-Port Gigabit Ethernet Line Card Configuration
Setting and Changing Loopback Mode
To set the loopback mode on a 1-Port Gigabit Ethernet line card interface, use the loopback command
in interface configuration mode.
loopback [internal | external]
[no] loopback [internal | external]
Where:
•
•
Use the no form of the command to stop the loopback.
For more information about this command, refer to the
Troubleshooting
In the following example, an internal loopback mode is defined for a 1-Port Gigabit Ethernet line card
interface:
router(config)# interface GigabitEthernet 1/0/0
router(config-if)# loopback internal
OL-8834-04
external runs a loopback that requires a loopback connector.
internal runs a loopback at the MAC controller.
Guide.
Cisco 10000 Series Internet Router
Cisco 10000 Series Router Line Card Configuaration Guide
Configuration Commands
11-5