Prisma SD-WAN introduced a SVI (Switch Virtual Interface) state configuration called Auto Operation State which can be configured to remain up, when all VLAN member ports are down, or, to be brought down if all member ports are down. This feature lets you control the SVI's operational status based on the link status of its member ports and ensures that the SVI's state accurately reflects the connectivity of the underlying VLAN member ports.

By default, the Auto Operational State is enabled and the SVI is up only when SVI is configured Admin Up and at least one L2 switch port-access or trunk port-is a member of the SVI and has its link up. When Auto Operational State is disabled, if the SVI is configured Admin Up, it will remain up.

When configuring an SVI for HA, if Auto Operational State is enabled and all VLAN member ports go down, the device will enter the backup High Availability (HA) mode. This is recommended for HA deployments. You can configure the SVI Auto Operational State when adding or modifying a VLAN/SVI on your ION devices.