Router stack with two ospf instance and super backbone both in area 0

[defccie]

I am trying two understand a concept. but it is difficult for me to find a RFC or solution document for it.

It has been used in very few networks

i see there are two set of ospf backbone in different instance and they(loopback) are redistributed in each other.

basically i think is it dual plane architecture, which will help provider in scalability, resilience and increase availability. 

nothing more i understand.

My question is why not provider used simple single ospf area architecture?

please provide the link to any solution document of rfc if any for this scenario.

[MadProf]

A router stack will act as if it is one device.  You are down to 2 OSPF instances and in order connect them, you will to redistribute into each other.

I will require more information before any design changes can be suggested. 

Edited April 9, 2022 by MadProf

[defccie]

my query is why not only one ospf  instance and same one area was chosen in first place

[MadProf]

There is not enough to determine why a network configured as you stated is allowed to exist. For example, it is easier to redistribute between two OSPF networks instead of collapsing both into one OSPF domain.