| Normal |
A regular OSPF area containing more than one router, each having at least one
OSPF-enabled interface to the area.
|
| Stub |
To reach the OSPF backbone, the routers in a stub area must send packets to
an area border router. Routes leading to non-OSPF domains are not advertised to
the routers in stub areas. The area border router advertises a single default
route into the stub area, which ensures that any OSPF packet that cannot be
matched to a specific route will match the default route. Any router connected to
a stub area is considered part of the stub area.
|
| NSSA |
In a Not-So-Stubby Area (NSSA), routes that lead out of the area into a
non-OSPF domain are made known to OSPF. However, the area itself continues to be
treated like a stub area
|
| Stub, no summary |
Same as a stub area without Link-State Advertisement (LSA) or external
destination information.
|
| NSSA, no summary |
Same as an NSSA, without Link-State Advertisement (LSA) or external
destination information.
|
| Area network |
Define an interface on which OSPF runs for the Area ID |
| (Optional) Area virtual link |
Configure the virtual link settings to maintain or enhance backbone area
connectivity. The settings must be defined for area boarder routers, and must be
defined within the backbone area (0.0.0.0). Specify the IP
address/bitmask for each virtual link to be included in the backbone area. The IP
address/bitmask describes the router ID of the router (neighbor) on the other side
of the virtual link.
|
