參考配置：

（1）

Router1>

Router1>en

Router1#show running Building configuration... Current configuration : 612 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname Router1 ! interface FastEthernet0/0 ip address 192.168.10.254 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial0/0 ip address 192.168.20.10 255.255.255.0 ! interface Serial0/1 no ip address shutdown ! router rip network 192.168.10.0 network 192.168.20.0 （2） Router2> Router2>en Route2r#show running Building configuration... Current configuration : 806 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname Router2 ! interface FastEthernet0/0 ip address 192.168.40.254 255.255.255.0 ip access-group 1 out duplex auto speed auto ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial0/0 no ip address shutdown ! interface Serial0/1 ip address 192.168.30.10 255.255.255.0 ip access-group 2 out clock rate 64000 ! router rip network 192.168.30.0 network 192.168.40.0 ! ip classless ! ! access-list 1 permit 192.168.10.0 0.0.0.255 access-list 1 deny any access-list 2 deny host 192.168.40.11 access-list 2 permit any （3） Router0>en Router0#show running Building configuration... Current configuration : 629 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname Router0 ! interface FastEthernet0/0 no ip address duplex auto speed auto shutdown ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial0/0 ip address 192.168.20.11 255.255.255.0 clock rate 64000 ! interface Serial0/1 ip address 192.168.30.11 255.255.255.0 ! router rip network 192.168.20.0 network 192.168.30.0