and there is a direct link between R1 & R4 as well. Customer wants to disconnect this link so in this case Area 1 will become discontigous. I setup this in a lab environment and found that routes are exchanging between R1 & R4 properly using their respective ABRs i.e R2 & R3 respectively. But routes from each discontigous part of Area 1 are installing as Inter Area routes into routing table of R1 & R4. My question is that what could be the consequences of running OSPF in this type of setup.
This is indeed the expected behavior. OSPF allows for non-backbone areas to be discontiguous and for routing updates between these areas to be propagated via the backbone area, hence these routes being seen as Inter-Area.
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