LAN state propagation allows propagating a LAN port's link state to its corresponding WAN port in a bypass pair. When LAN connectivity to a downstream switch is lost, the LAN port state is communicated to the upstream WAN device, thereby allowing traffic to take alternate paths through other Prisma SD-WAN LAN ports. LAN State Propagation is applicable only in the LAN-to-WAN direction. In effect, when a LAN port in a bypass pair goes down, it also brings down the corresponding WAN port of the bypass pair. However, in a failure with a WAN port, the LAN port will continue to remain up.