Chapter 9 High Availability for FortiOS 5.0 : An introduction to the FGCP : FGCP HA terminology : Link failover
  
Link failover
Link failover means that if a monitored interface fails, the cluster reorganizes to re-establish a link to the network that the monitored interface was connected to and to continue operating with minimal or no disruption of network traffic. See also “Device failover, link failover, and session failover”.