Chapter 2 Advanced Routing for FortiOS 5.0 : Advanced Static Routing : Advanced static example: ECMP failover and load balancing
  
Advanced static example: ECMP failover and load balancing
Equal Cost Multi-Path (ECMP) load balancing and failover are methods that extend basic static routing. They allow you to use your network bandwidth more effectively and with less down time than if you used basic static routing alone.
The concepts in this section include:
Equal-Cost Multi-Path (ECMP)
Configuring interface status detection for gateway load balancing
Configuring spillover or usage-based ECMP
Configuring weighted static route load balancing
Video: Redundant Internet connections using ECMP