Chapter 2 Advanced Routing for FortiOS 5.0 : Routing Information Protocol (RIP) : Troubleshooting RIP : Holddowns and Triggers for updates : Triggers
  
Triggers
Triggered RIP is an alternate update structure that is based around limiting updates to only specific circumstances. The most basic difference is that the routing table will only be updated when a specific request is sent to update, as opposed to every time the routing table changes. Updates are also triggered when a unit is ‘powered on’, which can include addition of new interfaces or devices to the routing structure, or devices returning to being available after being unreachable.