Loopback is a logical, virtual interface used
to emulate a WAN port to provide LAN functionality. You can free
up a physical port previously used for LAN/WAN configuration by
designating a loopback interface. You can configure a maximum of
four loopback interfaces per device.
ION devices on
4.5.3 or later
at a site, support loopback interface. A loopback
interface can only be used as a WAN port on interfaces with no hardware
bypass circuitry. Interfaces with no hardware bypass circuitry per
device are as follows:
ION 1000—All ports.
ION 1200—All ports.
ION 2000—Ports 1–3.
ION 7000—Ports 1–4, 9–14.
Virtual IONs—All non-controller ports.
interface may be brought up or down administratively and may not contain
any sub-interfaces or IP configurations.
You can update
or delete a loopback interface. However, you cannot delete if it
is part of a bypass pair.
Decouple a port coupled with another port before a loopback
interface can be coupled to create a bypass pair.
The only valid option in the Use These Ports For drop-down is
Private Layer 2 for a bypass pair that is made up of a physical
LAN port and a loopback interface as the WAN port.
The network policy rules assigned to such a site must not have
any rules using the Direct on private WAN path. Valid paths are
Direct on public or VPN on public. Traffic is dropped if a direct
on private path is used.
select a device
Configure the device
On the interface configuration page for a device, click
add icon to add a loopback interface
administratively bring the interface up or down.
The system assigns a default loopback ID to the interface.
A confirmation message displays that the loopback interface is successfully created.
Next, select a port to be configured with a loopback
administratively bring the interface up or down. The default is
select the Loopback Interface.
A confirmation message displays.
to create a bypass
pair with the loopback interface successfully.
A confirmation message displays the port's successful creation
and the loopback interface.
Use These Ports For
from the drop-down.
This is the only valid option for a bypass pair that is
made of a physical LAN port and a loopback interface for the WAN
If you choose
Copy Settings from
, select the bypass pair to copy the settings.
If not, you may leave it blank.
Similar to configuring bypass pairs, for
IP Address at
and toggle the scope tp
Save Bypass Pair
The port and the loopback interface are displayed under