PLANET WGS3-2820 - Manual (Page 239)

User’s Manual of WGS3-2820/WGS3-5220
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4.6.4.10 OSPF Virtual Link Configuration
All OSPF areas must connect to the backbone. If an area does not have a direct physical connection to the
backbone, you can configure a virtual link that provides a logical path to the backbone. To connect an isolated area
to the backbone, the logical path can cross a single nonbackbone area to reach the backbone. To define the path,
you must specify one endpoint on the ABR that connects the isolated area to the common nonbackbone area, and
the other endpoint on the ABR that connects this common nonbackbone area and the backbone itself. (However,
note that you cannot configure a virtual link that runs through a stub or NSSA area.)
Virtual links can also be used to create a redundant link between any area and the backbone to help prevent
partitioning, or to connect two existing backbone areas into a common backbone.
To configure a virtual link, specify the transit area through which the endpoint routers connect, and the address of
the router on this side of the link.
Figure 4-6-27 OSPF Virtual Link Configuration
Selection Criteria
。 Create New Virtual Link - Select this option from the dropdown menu to define a new virtual link. The area portion
of the virtual link identification is fixed: you will be prompted to enter the Neighbor Router ID on a new screen.