Outbound Load Balancing and Failover (Auto Routing) Load Balancing & Fault Tolerance
status changes, the LAN environment settings (such as gateway, netmask, router policies, proxy settings, etc) all need
to be adjusted.
Fault Tolerance Mechanism
As previously stated, without WAN load-balancer such as FortiWAN, the traditional way of using multiple WAN links
always involves human intervention.
FortiWAN has an internal “Virtual Trunk” circuit, which is essentially a combination of the multiple WAN links. Auto
routing is capable of adjusting the ‘Virtual Trunk” to include only the WAN links that are functioning normally and to
direct outbound traffic through the “Virtual Trunk circuit” without human intervention. Network users will therefore not
be able to notice any change of status in WAN links (See "WAN Link Health Detection").
The figure above illustrates auto routing securing uninterrupted connection to the internet even during WAN link
failures. Compared to the traditional multiple WAN link usage, auto routing can effectively use all available WAN links
FortiWAN Handbook
Fortinet Technologies Inc.
117
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