OSPF + AH Interchassis

[Translator]

First of all, hello and thank to all who provide their help and guidance in the community

I would like to do the following queries regarding the configuration of AH Interchassis with OSPF on the ISR 4000 Series routers, I do not understand the configuration as would be in the following case:

      Router

    INTERNET

          | 

          |

       SITE-1

    interchassis

R-1 — R-2

       OSPF SITE-2

           |—R-3 OSPF

QUESTIONS

1- how do I have to configure to have an Active/Standby configuration , so that the routing will be maintained and not lost in case the R-1 router has a failure?

2- R-1 and R-2 will act as a cluster with Interchassis configured ?

3- R-3 will be adjacent to both router or only to the Active router?

There is not so much and little information about the configuration with this feature ( SSO/NSF/NSR/ETC,,,), nor is there any example of configuration with different topologies from Cisco.

i would appreciate guidance on this subject, first hand thank you all, greetings!!

[MHM Cisco World]

I have one Idea,
you connect the three router in Site 2 via one broadcast, 
so run HSRP and make R3 have static route toward the VIP of HSRP.

for OSPF can you more elaborate what you mean OSPF cluster?

[Translator]

Hello, thank you very much for answering, what I need is to have 2 Router on HA(High Availability), but also belong to an OSPF 0 area, and the Router responds to IP ROUTE OSPF queries in case the primary Router fails, the primarysecondary router responds to requests for the OSPF ROUTE), IP subtracts a reference image.