Prisma SD-WAN introduced a SVI 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. By default, 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.