OSPF路由过滤专题要点(3)

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A(config-router)#distribute-list 1 in 配置前

A(config)#show ip route IPv4 Routing Table:

Dest Mask Gw Interface Owner pri metric 1.1.1.1 255.255.255.255 1.1.1.1 loopback1 address 0 0 2.2.2.2 255.255.255.255 2.2.2.2 loopback2 address 0 0 3.3.3.3 255.255.255.255 3.3.3.3 loopback3 address 0 0 4.4.4.4 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 5.5.5.5 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 6.6.6.6 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 A(config)#show ip ospf database

OSPF Router with ID (1.1.1.1) (Process ID 1) Router Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum Link count 10.10.20.20 10.10.20.20 168 0x80000013 0x72dd 1 4.4.4.4 4.4.4.4 165 0x80000013 0xbdfb 1 1.1.1.1 1.1.1.1 170 0x80000017 0x3a1f 2 Net Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum 10.10.20.20 10.10.20.20 163 0x8000000c 0x7f19 10.10.10.20 4.4.4.4 1425 0x8000000d 0x9762 Summary Net Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum 30.30.30.0 4.4.4.4 223 0x8000000f 0xc223 30.30.30.0 1.1.1.1 1010 0x80000001 0x39c6 20.20.20.0 4.4.4.4 1479 0x8000000d 0x30d5 20.20.20.0 1.1.1.1 1010 0x80000001 0xa27b Router Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum Link count

4.4.4.4 4.4.4.4 161 0x80000015 0xd1bc 2 1.1.1.1 1.1.1.1 176 0x80000015 0x2595 2 Net Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum 20.20.20.20 4.4.4.4 1376 0x8000000d 0x2ead 30.30.30.20 4.4.4.4 161 0x80000010 0xbefb Summary Net Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum 10.10.20.0 4.4.4.4 220 0x8000000b 0x39e1 10.10.20.0 1.1.1.1 1011 0x80000001 0x9d94 10.10.10.0 4.4.4.4 1536 0x8000000d 0x998a 10.10.10.0 1.1.1.1 1011 0x80000001 0xc30 Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag 4.4.4.4 4.4.4.4 810 0x8000000e 0xc909 3221225472 1.1.1.1 1.1.1.1 1011 0x80000001 0xc82f 3221225472 5.5.5.5 4.4.4.4 810 0x8000000e 0x9b33 3221225472 2.2.2.2 1.1.1.1 1011 0x80000001 0x9a59 3221225472 6.6.6.6 4.4.4.4 810 0x8000000e 0x6d5d 3221225472 3.3.3.3 1.1.1.1 1011 0x80000001 0x6c83 3221225472 配置后: A#sh ip route IPv4 Routing Table:

Dest Mask Gw Interface Owner pri metric 1.1.1.1 255.255.255.255 1.1.1.1 loopback1 address 0 0 2.2.2.2 255.255.255.255 2.2.2.2 loopback2 address 0 0 3.3.3.3 255.255.255.255 3.3.3.3 loopback3 address 0 0 4.4.4.4 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 6.6.6.6 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 A#show ip ospf database

OSPF Router with ID (1.1.1.1) (Process ID 1) Router Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum Link count 10.10.20.20 10.10.20.20 244 0x80000013 0x72dd 1 4.4.4.4 4.4.4.4 241 0x80000013 0xbdfb 1 1.1.1.1 1.1.1.1 246 0x80000017 0x3a1f 2 Net Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum 10.10.20.20 10.10.20.20 239 0x8000000c 0x7f19 10.10.10.20 4.4.4.4 1501 0x8000000d 0x9762 Summary Net Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum 30.30.30.0 4.4.4.4 299 0x8000000f 0xc223 30.30.30.0 1.1.1.1 1086 0x80000001 0x39c6 20.20.20.0 4.4.4.4 1555 0x8000000d 0x30d5 20.20.20.0 1.1.1.1 1086 0x80000001 0xa27b Router Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum Link count 4.4.4.4 4.4.4.4 236 0x80000015 0xd1bc 2 1.1.1.1 1.1.1.1 251 0x80000015 0x2595 2 Net Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum 20.20.20.20 4.4.4.4 1451 0x8000000d 0x2ead 30.30.30.20 4.4.4.4 236 0x80000010 0xbefb Summary Net Link States (Area 0.0.0.100)

Link ID ADV Router Age Seq# Checksum 10.10.20.0 4.4.4.4 295 0x8000000b 0x39e1 10.10.20.0 1.1.1.1 1086 0x80000001 0x9d94 10.10.10.0 4.4.4.4 1611 0x8000000d 0x998a 10.10.10.0 1.1.1.1 1086 0x80000001 0xc30

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag 4.4.4.4 4.4.4.4 885 0x8000000e 0xc909 3221225472 1.1.1.1 1.1.1.1 1086 0x80000001 0xc82f 3221225472 5.5.5.5 4.4.4.4 885 0x8000000e 0x9b33 3221225472 2.2.2.2 1.1.1.1 1086 0x80000001 0x9a59 3221225472 6.6.6.6 4.4.4.4 885 0x8000000e 0x6d5d 3221225472 3.3.3.3 1.1.1.1 1086 0x80000001 0x6c83 3221225472

可见,使用ACL过滤OSPF LSA 5类路由不会影响LSA的导入。 1. 使用prefix-list过滤

ROUTER A上配置为:

A(config)# ip prefix-list test seq 1 deny 5.5.5.5 32 //配置一个名为test的前缀列表 A(config)# ip prefix-list test seq 2 permit 0.0.0.0 0 //序号小的优先执行 A(config)#router ospf 1

A(config-router)#distribute-list prefix test in 配置后:

A(config-router)#show ip route IPv4 Routing Table:

Dest Mask Gw Interface Owner pri metric 1.1.1.1 255.255.255.255 1.1.1.1 loopback1 address 0 0 2.2.2.2 255.255.255.255 2.2.2.2 loopback2 address 0 0 3.3.3.3 255.255.255.255 3.3.3.3 loopback3 address 0 0 4.4.4.4 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 6.6.6.6 255.255.255.255 20.20.20.20 vlan200 ospf 110 20 ……

配置后show ip ospf database结果证明数据库也是不变的.即过滤了LSA 5类的路由，但是数据库上还是会有这条5类LSA的。 2. 使用route－map过滤

在原有的基础上，我们在ROUTER A设备上再连接一台路由器，具体见图4：

图4说明：在area 0 中加入ROUTER C ，宣告相应网段。在ROUTER B上学习到10.10.20.0/24

网段的路由,我们用route-map命令将其过滤.

ROUTER B上配置为:

B(config) #acl extend number 100

B(config-ext-acl)#rule 1 deny ip 10.10.20.0 0.0.0.255 any B(config-ext-acl)# rule 2 permit ip any any B(config)#route-map test permit 1 B(config-route-map)#match ip address 100 B(config) #router ospf 1

B(config-router)#distribute-list route-map test in 验证,在配置前: B#show ip route IPv4 Routing Table:

Dest Mask Gw Interface Owner pri metric 1.1.1.1 255.255.255.255 20.20.20.10 vlan200 ospf 110 20 2.2.2.2 255.255.255.255 20.20.20.10 vlan200 ospf 110 20 3.3.3.3 255.255.255.255 20.20.20.10 vlan200 ospf 110 20 4.4.4.4 255.255.255.255 4.4.4.4 loopback1 address 0 0 5.5.5.5 255.255.255.255 5.5.5.5 loopback2 address 0 0 6.6.6.6 255.255.255.255 6.6.6.6 loopback3 address 0 0 10.10.10.0 255.255.255.0 10.10.10.20 vlan100 direct 0 0 10.10.10.20 255.255.255.255 10.10.10.20 vlan100 address 0 0 10.10.20.0 255.255.255.0 10.10.10.10 vlan100 ospf 110 2 //配置后无此路由 20.20.20.0 255.255.255.0 20.20.20.20 vlan200 direct 0 0 20.20.20.20 255.255.255.255 20.20.20.20 vlan200 address 0 0 30.30.30.0 255.255.255.0 30.30.30.20 vlan300 direct 0 0 30.30.30.20 255.255.255.255 30.30.30.20 vlan300 address 0 0 B#show ip ospf database

OSPF Router with ID (4.4.4.4) (Process ID 1) Router Link States (Area 0.0.0.0)

Link ID ADV Router Age Seq# Checksum Link count

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