Hi,
Can someone explain me, in OSPF, - Why every area must be connected to area 0 and why those routes in areas which are not connected to area 0 are not being redistributed across the OSPF domain. ( which led virtual link concept i suppose ) - Why any router which is an ABR should be connected to area 0 and why a router which is not connected to area 0 but connected to multiple areas do not summarize the type 3 LSAs. Also please explain one more doubt in the picture attached with this thread. When checked in R5, i am able to see all the routes including the route between R1 and R2 ( *this is not connected to area 0, yet i am able to see the routes and there is no Virtual link configured )* Thanks Chid
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