Virtual Routers
The firewall uses virtual routers to obtain routes to other subnets by manually defining a route (static routes) or through participation in Layer 3 routing protocols (dynamic routes). The best routes obtained through these methods are used to populate the firewall’s IP route table. When a packet is destined for a different subnet, the Virtual Router obtains the best route from this IP route table and forwards the packet to the next hop router defined in the table.
The Ethernet interfaces and VLAN interfaces defined on the firewall receive and forward the Layer 3 traffic. The destination zone is derived from the outgoing interface based on the forwarding criteria, and policy rules are consulted to identify the security policies to be applied. In addition to routing to other network devices, virtual routers can route to other virtual routers within the same firewall if a next hop is specified to point to another virtual router.
You can configure the virtual router to participate with dynamic routing protocols (BGP, OSPF, or RIP) as well as adding static routes. You can also create multiple virtual routers, each maintaining a separate set of routes that are not shared between virtual routers, enabling you to configure different routing behaviors for different interfaces.
Each Layer 3 interface, loopback interface, and VLAN interface defined on the firewall must be associated with a virtual router. While each interface can belong to only one virtual router, multiple routing protocols and static routes can be configured for a virtual router. Regardless of the static routes and dynamic routing protocols configured for a virtual router, a common general configuration is required. The firewall uses Ethernet switching to reach other devices on the same IP subnet.
The virtual router on the firewall supports the following Layer 3:
RIP OSPF OSPFv3 BGP
Define a Virtual Router General Configuration
Gather the required information from your network administrator. Interfaces that you want to route Administrative distances for static, OSPF internal, OSPF external, IBGP, EBGP and RIP
Create the virtual router and name it. Select Network > Virtual Routers. Click Add and enter a name for the virtual router. Select interfaces to apply to the virtual router. Click OK.
Select interfaces to apply to the virtual router. Click Add in the Interfaces box. Select an already defined interface from the drop-down. Repeat this step for all interfaces that you want to add to the virtual router.
Set Administrative Distances for static and dynamic routing. Set Administrative Distances as required. Static —Range is 10-240; default is 10. OSPF Internal —Range is 10-240; default is 30. OSPF External —Range is 10-240; default is 110. IBGP —Range is 10-240; default is 200. EBGP —Range is 10-240; default is 20. RIP —Range is 10-240; default is 120.
Save virtual router general settings. Click OK to save your settings.
Commit your changes. Click Commit. The firewall can take up to 90 seconds to save your changes.

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