Managing Port Redundancy on Gigabit Ethernet I/O Modules

By default, the software manages port redundancy on GE I/O modules automatically. However, you can manage redundancy on GE I/O modules as follows:

Specify the time that the router waits for a port on a GE I/O module to become active before the router switches to the redundant port.
Force a GE I/O module to switch operation from one port to the other.
Disable port redundancy by specifying operation on one port only.

If you manage port redundancy manually, the router retains the manual configuration after the module reboots.

You can monitor the port redundancy configuration with the show interfaces gigabitEthernet command.

Note: The router manages failover in the same way for the GE I/O Modules and the GE-2 SFP I/O module.

link failover force

Use to force a GE I/O module to switch operation from one port to the other.
Select an interface on the GE I/O module before you issue this command.
Examplehost1(config)#interface gigabitEthernet 5/0 host1(config-if)#link failover force
There is no no version.
See link failover force.

link failover timeout

Use to specify the time that the router waits for a port on a GE I/O module to become active before the router switches to the redundant port.
Select an interface on the GE I/O module before you issue this command.
Specify a time in the range 100–10,000 ms.
Examplehost1(config)#interface gigabitEthernet 5/0 host1(config-if)#link failover timeout 1000
Use the no version to restore the default situation in which the router sets this time automatically.
See link failover timeout.

link selection

Use to disable redundancy on a GE I/O module by allowing operation on the specified port only.
Select an interface on the GE I/O module before you issue this command.
Examplehost1(config)#interface gigabitEthernet 5/0 host1(config-if)#link selection secondary
Use the no version to restore the default situation in which port redundancy is enabled.
See link selection.