gistfile1.txt

sample Input config :
 so for a config like 
router ospf 2
 router-id 2.2.2.2
 summary-in enable
 external-out enable
 bfd minimum-interval 55
 bfd fast-detect strict-mode
 bfd multiplier 4
 cost 2
 authentication-key encrypted 14161C180506262E302D2021
 authentication message-digest keychain ansibleiosxr
 packet-size 577
 weight 2
 passive disable
 database-filter all out enable
 priority 1
 mtu-ignore enable
 flood-reduction enable
 dead-interval 2
 retransmit-interval 2
 demand-circuit enable
 hello-interval 1
 transmit-delay 2
 default-metric 10
 area 10
  cost 11
  authentication message-digest keychain myarea10
  nssa no-redistribution no-summary
  default-cost 10
 !
 area 20
  cost 20
  authentication keychain myarea
  stub no-summary
  default-cost 20
 !
 area 30
  bfd minimum-interval 60
  bfd fast-detect strict-mode
  bfd multiplier 10
  authentication-key encrypted 12180B041B090001
  mpls ldp sync
  mtu-ignore enable
  dead-interval 30
  hello-interval 20
  transmit-delay 30
  mpls ldp sync-igp-shortcuts disable
  range 192.0.20.0/24 advertise
  range 192.0.21.0/24 advertise
  mpls traffic-eng
 !
 vrf blue
  area 20
   cost 90
  !
 !
!
router ospf 3
 cost 20
 authentication message-digest keychain ansibletest
 adjacency stagger 1 100
 auto-cost reference-bandwidth 2
 capability type7 prefer
 capability opaque disable
 apply-weight bandwidth 22
 address-family ipv4 unicast
!
router ospf 30
!
router ospf Trial
 area 12
  multi-area-interface BVI12
   authentication
  !
 !
!

Output by IOSXR flat config generator
router ospf 2
router ospf 2 router-id 2.2.2.2
router ospf 2 summary-in enable
router ospf 2 external-out enable
router ospf 2 bfd minimum-interval 55
router ospf 2 bfd fast-detect strict-mode
router ospf 2 bfd multiplier 4
router ospf 2 cost 2
router ospf 2 authentication-key encrypted 14161C180506262E302D2021
router ospf 2 authentication message-digest keychain ansibleiosxr
router ospf 2 packet-size 577
router ospf 2 weight 2
router ospf 2 passive disable
router ospf 2 database-filter all out enable
router ospf 2 priority 1
router ospf 2 mtu-ignore enable
router ospf 2 flood-reduction enable
router ospf 2 dead-interval 2
router ospf 2 retransmit-interval 2
router ospf 2 demand-circuit enable
router ospf 2 hello-interval 1
router ospf 2 transmit-delay 2
router ospf 2 default-metric 10
router ospf 2 area 10
router ospf 2 area 10 cost 11
router ospf 2 area 10 authentication message-digest keychain myarea10
router ospf 2 area 10 nssa no-redistribution no-summary
router ospf 2 area 10 default-cost 10
router ospf 2 area 20
router ospf 2 area 20 cost 20
router ospf 2 area 20 authentication keychain myarea
router ospf 2 area 20 stub no-summary
router ospf 2 area 20 default-cost 20
router ospf 2 area 30
router ospf 2 area 30 bfd minimum-interval 60
router ospf 2 area 30 bfd fast-detect strict-mode
router ospf 2 area 30 bfd multiplier 10
router ospf 2 area 30 authentication-key encrypted 12180B041B090001
router ospf 2 area 30 mpls ldp sync
router ospf 2 area 30 mtu-ignore enable
router ospf 2 area 30 dead-interval 30
router ospf 2 area 30 hello-interval 20
router ospf 2 area 30 transmit-delay 30
router ospf 2 area 30 mpls ldp sync-igp-shortcuts disable
router ospf 2 area 30 range 192.0.20.0/24 advertise
router ospf 2 area 30 range 192.0.21.0/24 advertise
router ospf 2 area 30 mpls traffic-eng
router ospf 2 vrf blue
router ospf 2 vrf blue area 20
router ospf 2 vrf blue  cost 90
router ospf 3
router ospf 3 cost 20
router ospf 3 authentication message-digest keychain ansibletest
router ospf 3 adjacency stagger 1 100
router ospf 3 auto-cost reference-bandwidth 2
router ospf 3 capability type7 prefer
router ospf 3 capability opaque disable
router ospf 3 apply-weight bandwidth 22
router ospf 3 address-family ipv4 unicast
router ospf 30
router ospf Trial
router ospf Trial area 12
router ospf Trial area 12 multi-area-interface BVI12
router ospf Trial area 12  authentication