Enabling and Disabling Interface Loopback Using the CLI

Use the Network Security appliance CLI to enable and disable interface loopback for one or all port pair interfaces.

To enable the interface loopback troubleshooting functionality:

Log in to the appliance CLI and go to configuration mode:
```
hostname > enable
hostname # configure terminal
```
Enable interface loopback for a specific interface:
```
hostname (config) # fedp loopback interface <InterfaceName> enable
```
where InterfaceName is the name of the pair port interface.
To enable interface loopback for all interfaces:
```
hostname (config) # fedp loopback interface ALL enable
```

Confirm your change:

hostname (config) # show fedp loopback status

To disable the interface loopback troubleshooting functionality:

Log in to the appliance CLI and go to configuration mode:
```
hostname > enable
hostname # configure terminal
```
Disable the interface loopback for a specific interface:
```
hostname (config) # no fedp loopback interface <InterfaceName> enable
```
where InterfaceName is the name of the pair port interface.
To disable interface loopback for all interfaces:
```
hostname (config) # no fedp loopback interface ALL enable
```

Confirm your change:

hostname (config) # show fedp loopback status