A virtual link is a logical extension of the OSPF backbone. As we learned earlier in this chapter, when implementing a multi-area OSPF network, one area must be designated as the backbone area and all non-backbone areas must be connected to the backbone area. In most cases, a physical link is used to connect the non-backbone area to the backbone area; however, this is not always possible or feasible. In addition to being used to connect areas that have no physical connection to the OSPF backbone, virtual links can also be used for redundancy as well as . . .
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