What are areas in OSPF?
Also, what are the OSPF area types?
OSPF area types
- Type 1 - Represents a router.
- Type 2 - Represents the pseudonode (designated router) for a multiaccess link.
- Type 3 - A network link summary (internal route)
- Type 4 - Represents an ASBR.
- Type 5 - A route external to the OSPF domain.
- Type 7 - Used in stub areas in place of a type 5 LSA.
Subsequently, question is, how do I set totally stubby area in OSPF? To configure an area as a totally stubby area you'd execute the area # stub no-summary in OSPF router configuration mode on the ABR. Totally NSSA – Is an area that permits LSA's 1, 2 and 7 while blocking 3 4 and 5. This stub area receives a default route from the ABR using a type 3 LSA.
Correspondingly, why areas are used in OSPF?
OSPF uses areas to simplify administration and optimize traffic and resource utilization. An area is simply a logical grouping of contiguous networks and routers. All routers in the same area have the same topology table and don't know about routers in the other areas.
What is an LSA in OSPF?
The link-state advertisement (LSA) is a basic communication means of the OSPF routing protocol for the Internet Protocol (IP). It communicates the router's local routing topology to all other local routers in the same OSPF area.