OSPF Area Types:
[bodyads] OSPF is a widely used protocol in service provider environments. Now a days the majority of the network setups use this protocol. OSPF is well suited for multi-vendor environments. OSPF allows 5 different area types, which provides flexibility, fast convergence and scalability. OSPF area types are:
- Backbone/ Non-backbone
- Stub Area
- Totally Stubby Area
- Not-So-Stubby Area (NSSA)
- Totally Not-So-Stubby Area (NSSA)
Backbone area:
The backbone area is the core of an OSPF network (also this area known as area 0 or area 0.0.0.0). All other areas are connected to backbone area, and inter-area routing happens via routers connected to the backbone area and to their own associated areas. The backbone area is responsible for distributing routing information between non-backbone areas. The backbone must be contiguous, but it does not need to be physically contiguous; backbone connectivity can be established and maintained through the configuration of virtual links.