U meant to say DR routers should have the same Mirrored config as HQ and all branches routers with the link connected to the DR ospf cost should be higher than the one connected to the HQ as your diagrams explains.
In our setup core switch in HQ is 6500 VSS with ABR config. Area 0 extends to Border ISP router . Border ISP router WAN port configured with multiple sub-interfaces with each goes to different Branches.
All the branch link configred as NSSA . see the core config
Any one in HQ failed I want all traffics goes to DR.
Core switch
router ospf 1
log-adjacency-changes
area 6 nssa no-summary
passive-interface Vlan6
network 20.3.1.1 0.0.0.0 area 1
network 20.3.2.1 0.0.0.0 area 1
network 20.3.22.1 0.0.0.0 area 1
network 20.4.1.1 0.0.0.0 area 0
network 20.5.1.1 0.0.0.0 area 1
network 20.6.1.2 0.0.0.0 area 1
network 20.7.1.1 0.0.0.0 area 1
network 20.7.2.1 0.0.0.0 area 1
network 20.7.3.1 0.0.0.0 area 1
network 20.8.21.1 0.0.0.0 area 6
network 20.9.1.1 0.0.0.0 area 1
network 150.16.1.3 0.0.0.0 area 1
network 150.16.2.1 0.0.0.0 area 1
network 150.17.0.1 0.0.0.0 area 0
!
HQ ISP router
router ospf 1
area 2 nssa no-summary
area 3 nssa no-summary
area 4 nssa no-summary
area 6 nssa no-summary
area 7 nssa no-summary
area 8 nssa no-summary
area 9 nssa no-summary
area 10 nssa no-summary
area 41 nssa no-summary
area 42 nssa no-summary
network 20.4.1.3 0.0.0.0 area 0
network 20.8.3.1 0.0.0.0 area 10
network 20.8.22.1 0.0.0.0 area 2
network 20.8.23.1 0.0.0.0 area 3
network 20.8.24.1 0.0.0.0 area 4
network 20.8.25.1 0.0.0.0 area 0
network 20.8.26.1 0.0.0.0 area 6
network 20.8.27.1 0.0.0.0 area 7
network 20.8.28.1 0.0.0.0 area 8
network 20.8.29.1 0.0.0.0 area 9
network 20.8.41.1 0.0.0.0 area 41
network 20.8.42.1 0.0.0.0 area 42
network 20.8.210.1 0.0.0.0 area 193
network 150.17.0.98 0.0.0.0 area 0
neighbor 20.8.25.2
neighbor 20.8.22.2
neighbor 20.8.23.2
neighbor 20.8.24.2
neighbor 20.8.26.2
neighbor 20.8.27.2
neighbor 20.8.28.2
neighbor 20.8.29.2
neighbor 20.8.41.2
neighbor 20.8.42.2
----------------------------
DR Router
router ospf 1
area 2 nssa no-summary
area 3 nssa no-summary
area 4 nssa no-summary
area 5 nssa no-summary
area 6 nssa no-summary
area 7 nssa no-summary
area 8 nssa no-summary
area 9 nssa no-summary
redistribute connected subnets
redistribute static subnets
network 20.8.12.1 0.0.0.0 area 2
network 20.8.13.1 0.0.0.0 area 3
network 20.8.14.1 0.0.0.0 area 4
network 20.8.15.0 0.0.0.255 area 0
network 20.8.17.1 0.0.0.0 area 7
network 20.8.18.1 0.0.0.0 area 8
network 20.8.19.1 0.0.0.0 area 9
network 20.26.2.20 0.0.0.0 area 0
network 20.66.0.1 0.0.0.0 area 5
neighbor 20.8.15.1
neighbor 20.8.12.2
neighbor 20.8.13.2
neighbor 20.8.14.2
neighbor 20.8.17.2
neighbor 20.8.18.2
neighbor 20.8.19.2
neighbor 20.8.16.2
!
Branch router
router ospf 1
log-adjacency-changes
area 8 nssa
redistribute static subnets
network 20.8.18.2 0.0.0.0 area 8
network 20.8.28.2 0.0.0.0 area 8
network 20.103.200.1 0.0.0.0 area 8
network 20.103.202.1 0.0.0.0 area 8
network 20.103.203.1 0.0.0.0 area 8
network 20.106.0.254 0.0.0.0 area 8
network 272.17.0.100 0.0.0.0 area 8
neighbor 20.8.28.1
neighbor 20.8.18.1
Branch router 2 interfaces connected to 2 isps
interface GigabitEthernet0/0
description Link ISP1
bandwidth 1000
ip address 20.8.18.2 255.255.255.0
ip flow monitor test-flow input
ip flow monitor test-flow output
ip ospf network point-to-multipoint non-broadcast
duplex auto
speed auto
priority-group 10
crypto map GETVPN_MAP
!
interface FastEthernet0/1/0
bandwidth 2000
ip address 20.8.28.2 255.255.255.0
ip flow monitor test-flow input
ip flow monitor test-flow output
ip ospf network point-to-multipoint non-broadcast
duplex auto
speed auto
crypto map GETVPN_MAP
