D-Link DFL-260-IPS-12 Product Manual - Page 177
Virtual Links Connecting Areas, Linking a Partitioned Backbone
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4.5.2. OSPF Concepts Chapter 4. Routing This virtual link is established between two Area Border Routers (ABRs) that are on one common area, with one of the ABRs connected to the backbone area. In the example below two routers are connected to the same area (Area 1) but just one of them, fw1, is connected physically to the backbone area. Figure 4.10. Virtual Links Connecting Areas In the above example, a Virtual Link is configured between fw1 and fw2 on Area 1 as it is used as the transit area. In this configuration only the Router ID has to be configured. The diagram shows that fw2 needs to have a Virtual Link to fw1 with Router ID 192.168.1.1 and vice versa. These virtual links need to be configured in Area 1. B. Linking a Partitioned Backbone OSPF allows for linking a partitioned backbone using a virtual link. The virtual link should be configured between two separate ABRs that touch the backbone from each side and have a common area in between. 177
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