R2#
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Loopback2
ip address 10.1.2.1 255.255.255.252
interface Loopback3
ip address 10.1.2.5 255.255.255.252
interface Loopback4
ip address 10.1.2.9 255.255.255.252
interface Serial2/1
ip address 192.168.0.2 255.255.255.0
interface Serial2/2
ip address 23.0.0.2 255.255.255.0
R3#
interface Loopback0
ip address 3.3.3.3 255.255.255.0
interface Loopback2
ip address 10.1.3.1 255.255.255.252
interface Loopback3
ip address 10.1.3.5 255.255.255.252
interface Loopback4
ip address 10.1.3.9 255.255.255.252
interface FastEthernet0/0
ip address 172.16.0.3 255.255.255.0
interface Serial2/1
ip address 23.0.0.3 255.255.255.0
二:配置过程
1:修改R1,R2,R3之间的链路带宽为64Kbps
R1(config)#int s2/1
R1(config-if)#bandwidth 64
R1(config-if)#int f0/0
R1(config-if)#bandwidth 64
R2(config)#int s2/1
R2(config-if)#bandwidth 64
R2(config-if)#int s2/2
R2(config-if)#bandwidth 64
R3(config)#int s2/1
R3(config-if)#bandwidth 64