Switch 的配置：!vlan 1!vlan 10!vlan 20!interface FastEthernet 0/1 switchport access vlan 10!interface FastEthernet 0/2 switchport access vlan 20!interface FastEthernet 0/3 switchport mode trunk!interface FastEthernet 0/4 switchport mode trunkR0 的配置：!interface FastEthernet 0/1 ip address 172.16.1.2 255.255.255.0 duplex auto speed auto!interface FastEthernet 0/2 ip address 172.16.2.2 255.255.255.0 duplex auto speed auto! interface Loopback 0 ip address 172.16.3.100 255.255.255.0!router ospf 1 network 172.16.0.0 0.0.255.255 area 0Core1的配置：Core1#show run!vlan 1!vlan 10!vlan 20!interface GigabitEthernet 0/3 switchport mode trunk!interface GigabitEthernet 0/23 no switchport no ip proxy-arp ip address 172.16.1.1 255.255.255.0!interface VLAN 10 no ip proxy-arp ip address 192.168.1.251 255.255.255.0 vrrp 1 priority 120 vrrp 1 ip 192.168.1.254!interface VLAN 20 no ip proxy-arp ip address 192.168.2.251 255.255.255.0 vrrp 2 ip 192.168.2.254!router ospf 1 network 172.16.0.0 0.0.255.255 area 0 network 192.168.0.0 0.0.255.255 area 0Core2的配置：Core2#show run !vlan 1!vlan 10!vlan 20!interface GigabitEthernet 0/4 switchport mode trunk!interface GigabitEthernet 0/24 no switchport ip address 172.16.2.1 255.255.255.0!interface VLAN 10 ip address 192.168.1.252 255.255.255.0 vrrp 1 ip 192.168.1.254!interface VLAN 20 ip address 192.168.2.252 255.255.255.0 vrrp 2 priority 120 vrrp 2 ip 192.168.2.254!router ospf 1 network 172.16.0.0 0.0.255.255 area 0 network 192.168.0.0 0.0.255.255 area 0!