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9 Cards in this Set
- Front
- Back
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Internal Router |
All interfaces reside within the same area. |
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Backbone Router |
A router with an interface in area 8 (The backbone). |
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Area Border Router (ABR) |
Connects two or more areas. |
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AS Boundary Router (ASBR) |
Connects to additional routing domains; typically located in the backbone. |
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Standard Area |
This Area is the default OSPF area type |
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Stub Area |
This area is where External Link (Type 5) LSA's are replaced with a default route.
This area is an area which does not receive route advertisements external to the autonomous system (AS) and routing from within the area is based entirely on a default route. |
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Totally Stubby Area |
Type 3, 4, and 5 LSA's are replaced with a default route.
This area is similar to a stub area. However, this area does not allow summary routes in addition to not having external routes, that is, inter-area (IA) routes are not summarized into totally stubby areas. |
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Not So Stubby Area (NSSA) |
This is a stub area containing an ASBR; type 5 LSA's are converted to type 7 within the area.
This area is a type of stub area that can import autonomous system external routes and send them to other areas, but still cannot receive AS-external routes from other areas. |
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Backbone Area |
This area is also known as area 0 or area 0.0.0.0 and forms the core of an OSPF network. All other areas are connected to it, and inter-area routing happens via routers connected to the backbone area and to their own associated areas. |
