Route Types Overview
You can configure three types of routing on a security device:
Static—Static routes are mappings of IP network addresses to next-hop destinations that you define on a Layer 3 forwarding device, such as a router. These mappings do not change unless you alter them. For networks that have few connections to other networks or where internetwork connections are relatively unchanging, it is usually more efficient to define static routes than to set up dynamic routing. The device retains static routes until you explicitly remove them. However, you can override static routes with dynamic routing information if necessary.
Dynamic—Dynamic routing involves routers exchanging information about the reachability of networks and subnetworks and adjusting routing tables by analyzing incoming routing update messages. These messages populate the network, directing routers to recalculate routes and change their routing tables accordingly.
Multicast—Multicast protocols enable routers to forward traffic from one source to multiple receivers simultaneously.
All routes are contained within a virtual router.