R1 配置：
version 12.3
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 subnet-zero
!
ip cef
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
duplex half
!
interface FastEthernet1/0
ip address 12.1.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
duplex auto
speed auto
!
interface Serial2/0
ip address 10.1.1.1 255.255.255.0
serial restart-delay 0
!
interface Serial2/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/7
no ip address
shutdown
serial restart-delay 0
!
ip classless
ip route 2.2.2.2 255.255.255.255 Serial2/0
ip route 2.2.2.2 255.255.255.255 FastEthernet1/0
ip route 2.2.2.2 255.255.255.255 Serial2/0 10.1.1.2
no ip http server
no ip http secure-server
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
R1 路由表：
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
S 2.2.2.2 is directly connected, Serial2/0
is directly connected, FastEthernet1/0
[1/0] via 10.1.1.2, Serial2/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial2/0
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet1/0
R2 配置 ：
version 12.3
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 subnet-zero
!
!
!
ip cef
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
duplex half
!
interface FastEthernet1/0
ip address 12.1.1.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial2/0
ip address 10.1.1.2 255.255.255.0
serial restart-delay 0
!
interface Serial2/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/7
no ip address
shutdown
serial restart-delay 0
!
ip classless
ip route 1.1.1.1 255.255.255.255 Serial2/0
ip route 1.1.1.1 255.255.255.255 FastEthernet1/0
ip route 1.1.1.1 255.255.255.255 Serial2/0 10.1.1.1
no ip http server
no ip http secure-server
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
R2 路由表：
R2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
S 1.1.1.1 is directly connected, Serial2/0
is directly connected, FastEthernet1/0
[1/0] via 10.1.1.1, Serial2/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial2/0
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet1/0
