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拓扑图： Fa0/1
Switch A 192.168.0.1 Fa0/1 Switch B 192.168.0.2 交换机配置：
Switch A通过设置loopback1~loopback4模拟直连用户网段。 Switch A:
hostname SwitchA vlan 1 !
vlan 2 !
enable secret level 1 5 !.t{bckn7|7zyglo-/-aeh`@~1'dfimL
enable secret level 15 5 !mLMp]K*7nAxB^\"[lowNq&#Z`@IOrJ%( !
interface FastEthernet 0/1 switchport access vlan 2 !
interface Vlan 1 !
interface Vlan 2
ip address 192.168.0.1 255.255.255.0
!
interface Loopback 0
ip address 1.1.1.1 255.255.255.255 !
interface Loopback 1
ip address 10.0.1.1 255.255.255.0 !
interface Loopback 2
ip address 10.0.2.1 255.255.255.0 !
interface Loopback 3
ip address 10.0.3.1 255.255.255.0
!
interface Loopback 4
ip address 10.0.4.1 255.255.255.0 !
! !
router ospf area 0.0.0.0
network 1.1.1.1 255.255.255.255 area 0.0.0.0 network 192.168.0.0 255.255.255.0 area 0.0.0.0 redistribute connected ! end
Switch B：
hostname SwitchB vlan 1 !
vlan 2 !
logging monitor
interface FastEthernet 0/1 switchport access vlan 2 !
interface Vlan 2
ip address 192.168.0.2 255.255.255.0 !
interface Loopback 0
ip address 2.2.2.2 255.255.255.255 !
router ospf area 0.0.0.0
network 2.2.2.2 255.255.255.255 area 0.0.0.0 network 192.168.0.0 255.255.255.0 area 0.0.0.0 ! end
在Switch B可以通过命令查看学习到的路由信息：
Switch B# show ip route
Type: C - connected, S - static, R - RIP, 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
Type Destination IP Next hop Interface Distance Metric Status ---- ------------------ --------------- --------- -------- -------- --------
O 1.1.1.1/32 192.168.0.1 VL2 110 2 Active C 2.2.2.2/32 0.0.0.0 Lo0 0 0 Active O E2 10.0.1.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.1.1/32 192.168.0.1 VL2 110 20 Active O E2 10.0.2.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.2.1/32 192.168.0.1 VL2 110 20 Active O E2 10.0.3.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.3.1/32 192.168.0.1 VL2 110 20 Active O E2 10.0.4.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.4.1/32 192.168.0.1 VL2 110 20 Active C 192.168.0.0/24 0.0.0.0 VL2 0 0 Active
路由过滤需求：
要求Switch B不学习10.0.3.0/24和10.0.4.0/24的路由信息。 Switch B增加如下配置：
ip access-list standard acl_1 deny 10.0.3.0 0.0.0.255 deny 10.0.4.0 0.0.0.255 permit any router ospf
distribute-list acl_1 in
路由过滤结果：
Switch B显示路由信息，发现成功的将10.0.3.0/24和10.0.4.0/24的路由信息删除。 Switch B#show ip route
Type: C - connected, S - static, R - RIP, 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
Type Destination IP Next hop Interface Distance Metric Status ---- ------------------ --------------- --------- -------- -------- --------
O 1.1.1.1/32 192.168.0.1 VL2 110 2 Active C 2.2.2.2/32 0.0.0.0 Lo0 0 0 Active O E2 10.0.1.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.1.1/32 192.168.0.1 VL2 110 20 Active O E2 10.0.2.0/24 192.168.0.1 VL2 110 20 Active O E2 10.0.2.1/32 192.168.0.1 VL2 110 20 Active C 192.168.0.0/24 0.0.0.0 VL2 0 0 Active
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