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OSPF NSSA with Authentication



hostname R1
!
!
interface Loopback1
 ip address 10.1.1.1 255.255.255.0
!!
interface Serial2/0
 ip address 10.1.12.1 255.255.255.0
 serial restart-delay 0
!
router ospf 1
 log-adjacency-changes

 network 10.1.0.0 0.0.255.255 area 0

hostname R2
interface Loopback2
 ip address 10.1.2.1 255.255.255.0
!!
interface Serial2/0
 ip address 10.1.12.2 255.255.255.0
 serial restart-delay 0
!
interface Serial2/1
 ip address 10.1.23.2 255.255.255.0
 ip ospf authentication message-digest
 ip ospf authentication-key cisco
 ip ospf message-digest-key 1 md5 cisco
 serial restart-delay 0
!!
router ospf 1
 log-adjacency-changes
 area 23 nssa no-summary
 network 10.1.23.0 0.0.0.255 area 23
 network 10.1.0.0 0.0.255.255 area 0

hostname R3
interface Loopback3
 ip address 10.1.3.1 255.255.255.0
!
interface Loopback20
 ip address 172.20.200.1 255.255.255.0
!!
interface Serial2/1
 ip address 10.1.23.3 255.255.255.0
 ip ospf authentication message-digest
 ip ospf authentication-key cisco
 ip ospf message-digest-key 1 md5 cisco
 serial restart-delay 0
!!
router ospf 1
 log-adjacency-changes
 area 23 nssa
 redistribute connected subnets
 network 10.1.3.0 0.0.0.255 area 23
 network 10.1.23.0 0.0.0.255 area 23

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