OSPF External Route Selection

[goldpartner]

On Router-A and Router-B，configure area 0 and area 1 as follows：

Router-A：

    area 0：10.5.5.5

    area 1：10.4.4.4

Router-B：

    area 0：10.5.5.6

    area 1：10.4.4.5

On Router-A, redistribute an external route into OSPF, so Router-A is an ASBR.

Question: On Router-B, what is the next hop of the external route above，10.5.5.5 or 10.4.4.4? Why?

[MHM Cisco World]

#show run
Building configuration...

Current configuration : 1737 bytes
!
upgrade fpd auto
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
!
!
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
redundancy
!
!
ip tcp synwait-time 5
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 10.0.0.1 255.255.255.0
duplex half
!
!
interface Serial1/0
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
!
interface FastEthernet2/0
ip address 100.0.0.1 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
!
!
interface FastEthernet3/0
ip address 200.0.0.1 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet3/1
no ip address
shutdown
duplex auto
speed auto
!
!
router ospf 10
log-adjacency-changes
redistribute static subnets
network 100.0.0.0 0.0.0.255 area 0
network 200.0.0.0 0.0.0.255 area 1
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip route 3.3.3.3 255.255.255.255 100.0.0.3
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
mgcp behavior g729-variants static-pt
!
!
!
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
!
end

R1#


R2#show run
Building configuration...

Current configuration : 1655 bytes
!
upgrade fpd auto
version 15.0
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
!
!
!
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
redundancy
!
!
ip tcp synwait-time 5
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
!
interface Serial1/0
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
!
interface FastEthernet2/0
ip address 100.0.0.2 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
!
!
interface FastEthernet3/0
ip address 200.0.0.2 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet3/1
no ip address
shutdown
duplex auto
speed auto
!
!
router ospf 10
log-adjacency-changes
network 100.0.0.0 0.0.0.255 area 0
network 200.0.0.0 0.0.0.255 area 1
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
mgcp behavior g729-variants static-pt
!
!
!
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
!
end