When the force linkdown feature is disabled, disabling a port using set port disable will disable the ability to forward traffic, but the link stays up. When force linkdown is enabled, disabling a port using set port disable will disable the link completely.
When force linkdown is enabled, disabling a port using the set port disable command will not disable PoE on that port.
Force linkdown is disabled by default.
Use the set forcelinkdown command in any command mode to enable the force linkdown feature on this device.
The following example enables the force linkdown feature on this device:
System(rw)->set forcelinkdown enable System(rw)->show forcelinkdown
ForceLinkDown feature is globally enabled.
System(rw)->