【实验拓扑】

 

OSPF过滤外部路由_第1张图片 

【实验要求】
1、按照上图配置好网络
2、在R5上增加1条静态路由150.1.50.0/24 指向null 0，并重发布到OSPF中
3、 在R6上增加1条静态路由150.1.60.0/24 指向null 0，并重发布到OSPF中
4、在R1与R4上设置过滤，过滤掉来自R6的外部路由

【实验思考】
我们知道OSPF从外部学习的路由都会标记为E2，我们可以通过route-map来过滤外部标记，但是如何只过滤来自于R6的呢？
同样用Route-map 中的过滤路由来源。

【配置方法】
R1 & R4
access-list 1 permit 150.1.6.6
!
route-map FILTER_OSPF deny 10
match route-type external type-2
match ip route-source 1
route-map FILTER_OSPF permit 1000
!
router ospf 1
distribute-list route-map FILTER_OSPF in
R5:
ip route 160.1.50.0 255.255.255.0 null 0
router ospf 1
redistribute static subnets
R6:
ip route 160.1.60.0 255.255.255.0 null 0
router ospf 1
redistribute static subnets

 

【过滤后验证方法】
过滤之前
----------------------------------------------------------------------------------------------->>
R1#show ip route ospf
     160.1.0.0/24 is subnetted, 2 subnets
O E2    160.1.50.0 [110/20] via 155.1.0.5, 00:01:00, Serial0/0
O E2    160.1.60.0 [110/20] via 155.1.146.6, 00:01:00, FastEthernet0/0
     150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
O       150.1.6.6/32 [110/11] via 155.1.146.6, 00:01:00, FastEthernet0/0
O       150.1.5.5/32 [110/65] via 155.1.0.5, 00:01:00, Serial0/0
O       150.1.4.4/32 [110/11] via 155.1.146.4, 00:01:00, FastEthernet0
过滤之后，仅剩余1条外部学习到的路由
----------------------------------------------------------------------------------------------->>
R1#show ip route ospf
     160.1.0.0/24 is subnetted, 1 subnets
O E2    160.1.50.0 [110/20] via 155.1.0.5, 00:00:03, Serial0/0
     150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
O       150.1.6.6/32 [110/11] via 155.1.146.6, 00:00:03, FastEthernet0/0
O       150.1.5.5/32 [110/65] via 155.1.0.5, 00:00:03, Serial0/0
O       150.1.4.4/32 [110/11] via 155.1.146.4, 00:00:03, FastEther


 

【实验前的基本配置】
----------------------------------------------------------------------------------------------
R1:
interface Fa 0/0
ip address 155.1.146.1 255.255.255.0
no shut
!
interface Serial 0/0
encapsulation frame-relay
no frame-relay inverse-arp
ip address 155.1.0.1 255.255.255.0
frame-relay map ip 155.1.0.5 105
frame-relay map ip 155.1.0.4 105
ip ospf priority 0
no shutdown
!
interface Loopback0
ip address 150.1.1.1 255.255.255.0
!
router ospf 1
router-id 150.1.1.1
network 155.1.146.1 0.0.0.0 area 1
network 150.1.1.1 0.0.0.0 area 1
network 155.1.0.1 0.0.0.0 area 0
R4:
interface Eth 0/1
ip address 155.1.146.4 255.255.255.0
!
interface Serial 0/0
encapsulation frame-relay
no frame-relay inverse-arp
ip address 155.1.0.4 255.255.255.0
frame-relay map ip 155.1.0.5 405
frame-relay map ip 155.1.0.1 405
ip ospf priority 0
!
interface Loopback0
ip address 150.1.4.4 255.255.255.0
!
router ospf 1
router-id 150.1.4.4
network 155.1.146.4 0.0.0.0 area 1
network 150.1.4.4 0.0.0.0 area 1
network 155.1.0.4 0.0.0.0 area 0
R5:
interface Serial 0/0
encapsulation frame-relay
no frame-relay inverse-arp
ip address 155.1.0.5 255.255.255.0
frame-relay map ip 155.1.0.4 504
frame-relay map ip 155.1.0.1 501
!
interface Loopback0
ip address 150.1.5.5 255.255.255.0
！
router ospf 1
router-id 150.1.5.5
network 150.1.5.5 0.0.0.0 area 0
network 155.1.0.5 0.0.0.0 area 0
neighbor 155.1.0.4
neighbor 155.1.0.1
R6:
interface Gig 0/1
ip address 155.1.146.6 255.255.255.0
!
interface Loopback0
ip address 150.1.6.6 255.255.255.0
!
router ospf 1
router-id 150.1.6.6
network 155.1.146.6 0.0.0.0 area 1
network 150.1.6.6 0.0.0.0 area 1