i want to ask about the benefits of having Multiple areas in OSPF network..?
i see that the only benefit is optimizing routing updates..and making summerization on ABRs.., but if the networks are not distributed contigiosly across the network.., and i can not make any kind of summerization.., why should i have Multiple areas..??
You can have multiple areas to contain your routing updates within your area, thereby the ospf database would be smaller resulting in faster convergence. If there is a link instability in your area that will not disturb other areas, if you have multiple areas. Summarization is also a very big benefit of this hierarchial structure, and everyone should consider making their networks contiguous.
I guess you can't see any impact for loopback interfaces as they are virtual interfaces and in most OSPF network it is defined as passive interface. I think you would have tried with any point-to-point/ethernet interfaces as ospf is based on LINK STATE algorithm (the stress is at link state).
Moreover ospf is multicasting based, which allows you any advertisement is limited to that particular group i.e. your area alone.
Whether you need backbone or not can be decided according to the route entries in your routing table and merits said at other reply .
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