Keep in mind the following limitations before you configure loopback interfaces for your Edges:
  • Only IPv4 addresses can be assigned for loopback interfaces.
  • Loopback interfaces can be configured only for Edges. They cannot be configured for Profiles.
  • Loopback interfaces must be configured only after the Edge activation is successful.
  • For any Edge that is not activated, the version of the customer operator profile is validated based on which either the Management IP Address section or the Loopback Interfaces section is visible. For example, if the version of the customer operator profile is 4.3 or above, the Loopback Interfaces section is visible at the Edge-level. Whereas, if the version of the customer operator profile is 4.2 or lower and the Edge is not activated, the Management IP Address section is visible at the Edge-level and Profile-level.
  • Loopback interface IDs must be unique across all segments within an Edge and must start from 1, as Zero (0) is not supported.
  • If you choose to configure loopback interfaces and Orchestrator management traffic through API, the default configuration keys for these two properties are not available. You must modify the updateConfigurationModule API to configure the loopback interface and management traffic source interface selection.
  • You can access loopback interfaces only through SSH. Loopback interface access through local Web UI is not supported.
  • Consider the following when you upgrade or downgrade your Edges:
    • If the Management IP address that is configured either at the Profile-level or at the Edge-level is not the default IP address (192.168.1.1) and when the Edge is upgraded to version 4.3 or above, the loopback interface is automatically created at the Edge-level with the configured Management IP address as the IP address of the loopback interface.
    • Consider that you have upgraded your SD-WAN Orchestrator to version 4.3 or above, whereas the Edge still runs on version 4.2 or lower. If you update the Management IP address configuration either at the Profile-level or at the Edge-level, and then upgrade your Edge to version 4.3 or above, all changes that you made to the Management IP address configuration will be lost.
    • When the Edge is downgraded to a version lower than 4.3, the Management IP address that was configured before the upgrade will be retained at the Profile-level and at the Edge-level.
    • Any changes made to the loopback interface configuration will be lost after the Edge downgrade.
    • For example, consider that you had the Management IP address as 1.1.1.1. When you upgrade your Edge to version 4.3 or above, the same IP address, 1.1.1.1 will be the IP address of the loopback interface at the Edge-level. Then, you change the loopback interface IP address to 2.2.2.2. When you downgrade your Edge to a version lower than 4.3, you will notice that the Management IP address at the Edge-level will still be 1.1.1.1 and the Management IP address at the Profile-level will be empty.