OSPF路由过滤测试

1.测试拓扑：
 
参考文档，思科：http://hi.baidu.com/tkgoood/item/30ce5f881e52edcd98255fdf
参考文档，华三：http://www.h3c.com.cn/MiniSite/Technology_Circle/Net_Reptile/The_Two/Home/Catalog/200911/655335_97665_0.htm
2.基本配置：
R1:
interface Loopback0
 ip address 1.1.1.1 255.255.255.0
interface Loopback1
 ip address 10.1.1.1 255.255.255.0
interface Loopback2
 ip address 100.1.1.1 255.255.255.0
interface FastEthernet0/0
 ip address 12.1.1.1 255.255.255.0
 no shut
ip route 0.0.0.0 0.0.0.0 12.1.1.2
R2:
interface Loopback0
 ip address 2.2.2.2 255.255.255.0
interface Ethernet0/0
 ip address 12.1.1.2 255.255.255.0
 no shut
interface Ethernet0/1
 ip address 23.1.1.2 255.255.255.0
 no shut
interface Ethernet0/2
 ip address 25.1.1.2 255.255.255.0
 no shut
ip route 1.1.1.0 255.255.255.0 12.1.1.1
ip route 10.1.1.0 255.255.255.0 12.1.1.1
ip route 100.1.1.0 255.255.255.0 12.1.1.1
R3:
interface Loopback0
 ip address 3.3.3.3 255.255.255.0
interface FastEthernet0/0
 ip address 23.1.1.3 255.255.255.0
 no shut
interface FastEthernet0/1
 ip address 34.1.1.3 255.255.255.0
 no shut
R4:
interface Loopback0
 ip address 4.4.4.4 255.255.255.0
interface Loopback1
 ip address 40.1.1.4 255.255.255.0
interface Loopback2
 ip address 100.1.1.4 255.255.255.0
interface FastEthernet0/0
 ip address 34.1.1.4 255.255.255.0
 no shut
R5:
interface Loopback0
 ip address 5.5.5.5 255.255.255.0
interface FastEthernet0/0
 ip address 25.1.1.5 255.255.255.0
 no shut
interface FastEthernet0/1
 ip address 56.1.1.5 255.255.255.0
 no shut
R6:
interface Loopback0
 ip address 6.6.6.6 255.255.255.0
interface Loopback1
 ip address 60.1.1.6 255.255.255.0
interface Loopback3
 ip address 100.1.1.6 255.255.255.0
interface FastEthernet0/0
 ip address 56.1.1.6 255.255.255.0
 no shut
3.ospf基本配置：
R2:
router ospf 2
 router-id 2.2.2.2
 redistribute static subnets
 network 23.1.1.0 0.0.0.255 area 1
 network 25.1.1.0 0.0.0.255 area 2
R3:
router ospf 3
 router-id 3.3.3.3
 network 23.1.1.0 0.0.0.255 area 1
 network 34.1.1.0 0.0.0.255 area 0
R4:
router ospf 4
 router-id 4.4.4.4
 redistribute connected subnets
 network 34.1.1.0 0.0.0.255 area 0
R5：
router ospf 5
 router-id 5.5.5.5
 network 25.1.1.0 0.0.0.255 area 2
 network 56.1.1.0 0.0.0.255 area 0
R6：
router ospf 6
 router-id 6.6.6.6
 redistribute connected subnets
 network 56.1.1.0 0.0.0.255 area 0
4.ospf路由确认：
A.R2 ospf动态路由确认：
R2#show ip route ospf
     34.0.0.0/24 is subnetted, 1 subnets
O IA    34.1.1.0 [110/20] via 23.1.1.3, 00:05:09, Ethernet0/1
     4.0.0.0/24 is subnetted, 1 subnets
O E2    4.4.4.0 [110/20] via 23.1.1.3, 00:04:26, Ethernet0/1
     6.0.0.0/24 is subnetted, 1 subnets
O E2    6.6.6.0 [110/20] via 25.1.1.5, 00:04:26, Ethernet0/2
     40.0.0.0/24 is subnetted, 1 subnets
O E2    40.1.1.0 [110/20] via 23.1.1.3, 00:04:26, Ethernet0/1
     56.0.0.0/24 is subnetted, 1 subnets
O IA    56.1.1.0 [110/20] via 25.1.1.5, 00:05:09, Ethernet0/2
     60.0.0.0/24 is subnetted, 1 subnets
O E2    60.1.1.0 [110/20] via 25.1.1.5, 00:04:26, Ethernet0/2
----希望R2只学习到两条ospf路由：40.0.0.0/24 和 60.0.0.0/24
B.R3 ospf动态路由确认：
R3#show ip route ospf
     1.0.0.0/24 is subnetted, 1 subnets
O E2    1.1.1.0 [110/20] via 23.1.1.2, 00:15:17, FastEthernet0/0
     100.0.0.0/24 is subnetted, 1 subnets
O E2    100.1.1.0 [110/20] via 34.1.1.4, 00:05:19, FastEthernet0/1
                  [110/20] via 23.1.1.2, 00:05:19, FastEthernet0/0
     4.0.0.0/24 is subnetted, 1 subnets
O E2    4.4.4.0 [110/20] via 34.1.1.4, 00:15:17, FastEthernet0/1
     40.0.0.0/24 is subnetted, 1 subnets
O E2    40.1.1.0 [110/20] via 34.1.1.4, 00:15:17, FastEthernet0/1
     10.0.0.0/24 is subnetted, 1 subnets
O E2    10.1.1.0 [110/20] via 23.1.1.2, 00:15:17, FastEthernet0/0
----希望R3通过R2只学习到一条ospf路由：10.0.0.0/24
C.R5 ospf动态路由确认：
R5#show ip route ospf
     1.0.0.0/24 is subnetted, 1 subnets
O E2    1.1.1.0 [110/20] via 25.1.1.2, 00:08:58, FastEthernet0/0
     100.0.0.0/24 is subnetted, 1 subnets
O E2    100.1.1.0 [110/20] via 56.1.1.6, 00:08:58, FastEthernet0/1
                  [110/20] via 25.1.1.2, 00:08:58, FastEthernet0/0
     6.0.0.0/24 is subnetted, 1 subnets
O E2    6.6.6.0 [110/20] via 56.1.1.6, 00:08:58, FastEthernet0/1
     10.0.0.0/24 is subnetted, 1 subnets
O E2    10.1.1.0 [110/20] via 25.1.1.2, 00:08:58, FastEthernet0/0
     60.0.0.0/24 is subnetted, 1 subnets
O E2    60.1.1.0 [110/20] via 56.1.1.6, 00:08:58, FastEthernet0/1
----希望R5通过R2只学习到一条ospf路由：10.0.0.0/24
5.ospf路由过滤：
A.R2路由过滤：
①出去的路由
ip access-list standard ospfout
 permit 10.1.1.0 0.0.0.255
router ospf 2
 distribute-list ospfout out
----因为在ABSR上做的控制，能控制LSA的发送
②进入的路由：
通过如下方式在R2上设置不能生效：
ip prefix-list ospf-R3-in permit 40.1.1.0/24
router ospf 2
 area 1 filter-list prefix ospf-R3-in in
----因为R2不是ABR,并且需要过滤的路由不是LSA3产生的。
通过在R2上的如下配置，可以生效：
ip access-list standard ospfin
 permit 40.1.1.0 0.0.0.255
 permit 60.1.1.0 0.0.0.255
router ospf 2
 distribute-list ospfin in
---上面的缺点是如果用OSPF接很多业务系统，并且路由条目会在不同业务系统有重复，而只需到某个特定业务系统的重复路由则无法做到，除非跑多个路由进程，每个路由进程对应一个area。
B.R3路由过滤：
在R3上实施如下策略不能生效：（因为40.1.1.0/24是LSA5，不是LSA3所以不能过滤）
ip prefix-list ospf-R3-in permit 40.1.1.0/24
router ospf 3
  area 0 filter-list prefix ospf-R3-in out
---通过上面的配置可以看到34.1.1.0/24会被过滤掉

----如果R2需要学到的路由不是重分布进入的建议用这种方式过滤，因为这样可以过滤LSA3.
http://songzhaogangboy.blog.163.com/blog/static/8641739620120251238712/