FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
OSPF areas are groupings of OSPF routers or logical parts of a network. An area's routing information can be sent as a summary to other areas.
Regular areas send and receive routing information including summaries, both OSPF routes and external routes learned through other means. Non-regular areas include the backbone area and stub areas.
The backbone area forms the core of an OSPF network. All other areas are connected to it through area border routers (ABR). It is the logical and physical structure for the autonomous system (AS) and is attached to multiple areas. The backbone area is responsible for distributing routing information between non-backbone areas. There is one backbone area in each AS. All OSPF areas must connect to the backbone area.
Stub areas do not receive external routes. Some stub areas, such as stub areas and not-so-stubby areas (NSSA) can import external routes but not receive them from other areas whereas others, such as totally-stubby areas (TSA), do not receive any summary or external routes at all. Stub areas generally use default routes to send traffic over external routes.
