hi, why should one recalculate routes using transit areas summary lsas, even if better paths exist through transit area. as a virtual link is considered as an unumbered p2p link, it is as good as the router has an interface to the backbone. referring to rfc2328 figure 17, RT1 chooses route network N1 through RT4, since that is an intra-area path, that is in accordance to the path preference rules of ospf. why do we give special treatment for transit areas. If the link were not a virtual-link and if it indeed is real p2p interface in to the backbone, we will not try to route the data to N1 through RT5, since the route through RT4 would be preferred. why special treatment for transit areas, and why can't we extend this treatment to other areas as well (neglecting the fact that area routing is protected by bad routing of other areas).
thanks in advance
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