Why this line appear

R2#show running-config
Building configuration…

Current configuration : 1143 bytes
!
upgrade fpd auto
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
no ip icmp rate-limit unreachable
!
!
!
!
!
!
no ip domain lookup
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
redundancy
!
!
ip tcp synwait-time 5
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 10.1.12.2 255.255.255.0
ip ospf 2 area 2
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.1.23.2 255.255.255.0
ip ospf 2 area 0
duplex auto
speed auto
!
router ospf 2
router-id 0.0.0.2
area 2 nssa
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip route 2.2.2.0 255.255.255.0 Null0
ip route 22.22.22.0 255.255.255.0 Null0
!
no cdp log mismatch duplex
!
!
!
control-plane
!
!
!
mgcp profile default
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
transport input all
!
!
end

R2#

R2 is NOT an ASBR Router, why this ouput displays in the first place ?

It’s because your router is an ABR that sits between a normal area and a Not So Stubby Area (NSSA). Area Border routers like this will receive Type-7 NSSA_External LSAs from ASBRs doing redistribution and the ABR will convert those for Type-5 External LSAs for injection into adjacent normal areas. Because this router is ready to convert Type-7 LSAs into Type-5 LSAs that categorizes it as an ASBR. Any router that originates Type-5 LSAs is an ASBR.

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