In a multi area like this where if we have a direct link from R5 to R7 and R6, we will have a shorter faster path to those routers, how should we fit it in with ospf protocol definition?
I can't come up with any solution other than merging area 1 and 2?!
my problem with this solution is what if we wanted to add another 7 routers to a new area, and that new area also has to be connected to all areas directly, then what?
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Even if you would have a direct link to those routers, packets from R5 would go to R2 which is the ABR with area 0. Routers in different areas will always chose a route over area 0 as it helps OSPF to avoid loops.
So in my opinion you don't really have to merge those two areas. It's more up to your design.
The problems start when you have 10+ areas per production router :). I opened a thread for that issue:
Maybe you find it useful :)
I just wanted to make sure
OSPF has this lack of full mesh connectivity in between Campuses/ASs, so any connection to a major network has to go over the backbone, for these designs you either better have to switch to eigrp or if you have a very big topology, Use Internal BGP with Eigrp
If any change in the topology occurs, it is the responsibility of the network manager to evaluate the necessary changes.
Having a static topology is never a good idea, since changes, such as those you propose, require dynamism, whether modifying the areas, reallocating the areas, changing the routing protocol, etc.
I am sure that before changes in your network you can make the best decision.
Anyway, if you have doubts about the necessary changes, you just have to post them and we will try to help you.