An SD-WAN policy rule specifies applications and services, and a
traffic distribution profile to determine how the firewall selects the preferred
path for an incoming packet that doesn’t belong to an existing session and that
matches all other criteria, such as source and destination zones, source and
destination IP addresses, and source user. The SD-WAN policy rule
also specifies a path quality profile of thresholds for latency, jitter, and packet
loss. When one of the thresholds is exceeded, the firewall selects a new path for
one or more applications, services, or both.