Configure Loopback Interfaces in Concerto

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A loopback interface is a virtual interface that is always up and ensures that the device is reachable. It is used primarily for testing and network management. You configure loopback interfaces in routing instances that route large amounts of data traffic and that require continuous connectivity. Loopback interfaces are primarily used for OSPF and BGP, because connectivity is never down. A routing instance or domain can have only one loopback interface.

For a service provider with two routers, each router has a loopback interface and the routers maintain data connectivity over the loopback interface.

To configure a loopback interface:

1. In Tenant view, select Configure > Network Interfaces.
   
   
   
   The Interfaces screen displays with the WAN tab selected by default.
    
2. Select the Loopback tab. The screen displays loopback interfaces that are configured.
   
   
    
3. Click the  Add icon to add a new loopback interface. The workflow to add a loopback interface displays, beginning with step 1, Loopback Settings.
   
   
    
4. Enter information for the following fields.
    

   Field	Description
   Category	Select Loopback.
   IPv4 Address	Enter the IPv4 address of the loopback interface.
   IPv6 Address	Enter the IPv6 address of the loopback interface.
   Is this interface for guest?	Disabled by default. Click the slider bar to enable the interface for guests. When enabled, the interface is designated for guest connectivity only. Guest user traffic is not mixed with enterprise traffic. You can select a routing instance that has been designated for use by guests.
   Routing Instance Name (Required)	Select a routing instance for the LAN interface. If you disable the guest user option, you can choose an enterprise routing instance. If you enable the guest user options, choose a guest routing instance.

5. Click Next or select workflow step 2, Permissions. The screen displays permissions for all of the configured roles.
   
   
    
6. Select or unselect permissions for each role, if needed.
7. Click Next or select workflow step 3, Review & Submit.
   
   
    
8. In the General section, enter a name for the interface in the Name field. You can also enter a description and tags. Under the Interface heading, select one of the following:
   • Disabled—Disable the interface
   • Enabled—Enable the interface
   • Variable—Select this option to parameterize whether the interface is enabled or disabled. Enter a name for the variable, which is a Boolean value. You can then choose whether this interface is enabled or disabled on a device-by-device basis in the Deploy lifecycle.
9. Review the configuration. Click the  Edit icon in any section to update the settings.
10. Click Submit to create the interface.