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falling within the configured range are described by a single LSA, thus
decreasing the size of the LSA database.
Values: 0.0.0.0−255.255.255.255
Default: 0.0.0.0
Mask Summary
IP Mask of the summary to be added.
Values: 0.0.0.0−255.255.255.255
Default: 0.0.0.0
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Describes the local state of a router or network. This includes the state of the
route's interfaces and adjacencies. Each link state advertisement is flooded
throughout the routing domain. The collected link state advertisements of all
routers and networks form the protocol's topological database.
Values: Yes, No
Default: No
The Area Details screen provides the following user-activated buttons:
Button
Submit
Area Table
Delete Area
Refresh
Virtual Link Table Screen
To permit maximum flexibility, OSPF allows the configuration of virtual links
to enable the backbone area to appear contiguous despite the physical reality.
In OSPF, the backbone is defined as an Area ID of 0.0.0.0. This backbone
cannot be disconnected in any way or some areas of the Autonomous System
become unreachable. This is because all inter-area traffic must go through the
backbone. In fact, the backbone is responsible of all inter-area routing
information distribution.
It is possible that an area cannot be connected directly to the backbone; in this
case a virtual link is used (see Figure 3.55). To establish or maintain the
connectivity of the backbone, virtual links can be configured through non-
backbone areas. Basically, virtual links are used to connect components that
are otherwise not connected to the backbone.
A virtual link is treated by OSPF as a point-to-point unnumbered network
joining two area border routers. The virtual link must be configured in both of
the area border routers.
A virtual link is defined by the following two parameters:
•
The Router ID of the virtual link's other endpoint
•
The non-backbone area across which the virtual link goes through.
Function
Sets any values that have been changed.
Returns you to the previous screen.
Deletes the currently defined Area.
Refreshes data on the current page.
W e b S e r v e r I n t e r f a c e
3-67
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