Best parties design ospf normal area

[TimeOut]

Hi anyone

I would like to know best parties design for normal area

https://ibb.co/TBrzyQF   Here's diagram to example

I have two site  A and B

Router 1 and Router 2  as same area 1

but 
Router 4 Area 2
Router 5 Area 3

Which one site is correct  design for normal area or anything will be fine

thx for answer

[Georg Pauwen]

Hello,

the design looks fine and will work Try to think of making areas 2 and 3 stub areas, since they have only one exit point...

[Giuseppe Larosa]

Hello @TimeOut ,

this design is correct as area 0 is in the middle interconnecting all areas.

A minor note is that R1 and R2 should have a common link in area 1, but OSPF supports your current setup, because LSA tpye 3 injected in the backbone have no reference to the original area-id.

Also there is no redundancy in the backbone some more links in area 0 would be desirable fro example another link between R2 and R4 could be helpful.

Hope to help

Giuseppe