Paradyne Hotwire 8300 User Manual page 80

2. Web Server Interface
Mask Summary IP Mask of the summary to be added.
Advertise 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.
The Area Details screen provides the following user-activated buttons:
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 for 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
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:
Access this screen by selecting the Virtual Link Table from the OSPF Parameters
table on the IP Gateway screen.
2-62
Values: 0.0.0.0 2 55.255.255.255
−
Default: 0.0.0.0
Values: Yes, No
Default: No
Button Function
Submit Sets any values that have been changed.
Area Table Returns you to the previous screen.
Delete Area Deletes the currently defined Area.
The Router ID of the virtual link's other endpoint
The non-backbone area across which the virtual link goes through.
April 2003
Figure 2-53). To establish or maintain the
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