配置如下：
R1#show run
Building configuration...
Current configuration : 1051 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R1
!
!
ip subnet-zero
!
!
no ip domain-lookup
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
no ip address
encapsulation frame-relay
serial restart-delay 0
no frame-relay inverse-arp
!
interface Serial1/0.1 multipoint
ip address 10.1.1.1 255.255.255.0
frame-relay map ip 10.1.1.2 102 broadcast
frame-relay map ip 10.1.1.3 103 broadcast
!
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
!
router ospf 100
router-id 1.1.1.1
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
neighbor 10.1.1.3 priority 1
neighbor 10.1.1.2 priority 1
!
ip classless
ip http server
!
!
line con 0
logging synchronous
no exec
line aux 0
line vty 0 4
!
end
R2#show run
Building configuration...
Current configuration : 980 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R2
!
!
ip subnet-zero
!
!
no ip domain-lookup
!
!
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.1.1.2 255.255.255.0
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 10.1.1.1 201 broadcast
frame-relay map ip 10.1.1.3 201 broadcast
no frame-relay inverse-arp
!
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
!
router ospf 100
router-id 2.2.2.2
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
neighbor 10.1.1.1 priority 1
!
ip classless
ip http server
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
End
R3#show run
Building configuration...
Current configuration : 980 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R3
!
!
ip subnet-zero
!
!
no ip domain-lookup
!
!
!
!
interface Loopback0
ip address 3.3.3.3 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.1.1.3 255.255.255.0
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 10.1.1.1 301 broadcast
frame-relay map ip 10.1.1.2 301 broadcast
no frame-relay inverse-arp
!
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
!
router ospf 100
router-id 3.3.3.3
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
neighbor 10.1.1.1 priority 1
!
ip classless
ip http server
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end
