(OSPF实验)OSPF ABR Typ

发布时间:2019-09-06 08:57:53编辑:auto阅读(1788)

    OSPF ABR Type 3 LSA Filtering
    Document ID: 00007


    目录

    提要

    正文

    TOPO如下

    基本配置如下

    验证

    附注


    讨论 OSPF ABR Type 3 LSA Filtering
    OSPF ABR Type 3 LSA Filtering只能在ABR上面做
    TOPO如下 

     

    l        R1

    l        R2

    l        R3
    interface Loopback0

     ip address 1.1.1.1 255.255.255.0

     ip ospf network point-to-point

    !

    interface Serial1/0

     ip address 12.1.1.1 255.255.255.0

     serial restart-delay 0

     no fair-queue

    !

    interface Serial2/0

     ip address 13.1.1.1 255.255.255.0

     serial restart-delay 0

    !

    router ospf 1

     router-id 1.1.1.1

     log-adjacency-changes

     network 12.1.1.0 0.0.0.255 area 0

     network 13.1.1.0 0.0.0.255 area

     

     

    interface Loopback0

     ip address 2.2.2.2 255.255.255.0

    !

    interface Serial2/0

     ip address 12.1.1.2 255.255.255.0

     serial restart-delay 0

    !

    router ospf 1

     router-id 2.2.2.2

     log-adjacency-changes

     network 12.1.1.0 0.0.0.255 area 0

     

    interface Loopback0

     ip address 3.3.0.3 255.255.255.0 secondary

     ip address 3.3.1.3 255.255.255.0 secondary

     ip address 3.3.2.3 255.255.255.0 secondary

     ip address 3.3.3.3 255.255.255.0

     ip ospf network point-to-point

    !

    interface Serial1/0

     ip address 13.1.1.3 255.255.255.0

     serial restart-delay 0

     no fair-queue

    !

    router ospf 1

     log-adjacency-changes

     network 3.3.0.0 0.0.255.255 area 1

     network 13.1.1.0 0.0.0.255 area 1

     

     

     

    测试:

     

    没有配置lsa type3过滤器之前 查看r2路由表

    r2#sho ip route | begin Ga

    Gateway of last resort is not set

     

         2.0.0.0/24 is subnetted, 1 subnets

    C       2.2.2.0 is directly connected, Loopback0

         3.0.0.0/24 is subnetted, 4 subnets

    O IA    3.3.0.0 [110/129] via 12.1.1.1, 00:00:51, Serial2/0

    O IA    3.3.1.0 [110/129] via 12.1.1.1, 00:00:57, Serial2/0

    O IA    3.3.2.0 [110/129] via 12.1.1.1, 00:00:57, Serial2/0

    O IA    3.3.3.0 [110/129] via 12.1.1.1, 00:00:45, Serial2/0

         12.0.0.0/24 is subnetted, 1 subnets

    C       12.1.1.0 is directly connected, Serial2/0

         13.0.0.0/24 is subnetted, 1 subnets

    O IA    13.1.1.0 [110/128] via 12.1.1.1, 00:10:40, Serial2/0

     

    配置过滤器  过滤掉3.3.3.0/24

    r1(config)#ip prefix-list area1-out seq 10 deny 3.3.3.0/24

    r1(config)#ip prefix-list area1-out seq 15 permit 0.0.0.0/0 le 32

    r1(config-router)#area 1 filter-list prefix area1-out out

    查看r1的数据库area 0  没有3.3.3.3

    1#sho ip os da

     

                OSPF Router with ID (1.1.1.1) (Process ID 1)

     

                    Router Link States (Area 0)

     

    Link ID         ADV Router      Age         Seq#       Checksum Link count

    1.1.1.1         1.1.1.1         11          0x80000006 0x00F080 2

    2.2.2.2         2.2.2.2         1909        0x80000004 0x0091DD 2

     

                    Summary Net Link States (Area 0)

     

    Link ID         ADV Router      Age         Seq#       Checksum

    3.3.0.0         1.1.1.1         406         0x80000004 0x00A648

    3.3.1.0         1.1.1.1         411         0x80000001 0x00A14F

    3.3.2.0         1.1.1.1         411         0x80000001 0x009659

    13.1.1.0        1.1.1.1         11          0x80000004 0x0027BF

     

    查看r2的路由表  没有3.3.3.0/24的条目

    r2#sho ip route | begin Ga

    Gateway of last resort is not set

     

         2.0.0.0/24 is subnetted, 1 subnets

    C       2.2.2.0 is directly connected, Loopback0

         3.0.0.0/24 is subnetted, 3 subnets

    O IA    3.3.0.0 [110/129] via 12.1.1.1, 00:07:55, Serial2/0

    O IA    3.3.1.0 [110/129] via 12.1.1.1, 00:08:01, Serial2/0

    O IA    3.3.2.0 [110/129] via 12.1.1.1, 00:08:01, Serial2/0

         12.0.0.0/24 is subnetted, 1 subnets

    C       12.1.1.0 is directly connected, Serial2/0

         13.0.0.0/24 is subnetted, 1 subnets

    O IA    13.1.1.0 [110/128] via 12.1.1.1, 00:17:45, Serial2/0

     

    --------------------------

    以下检验area rangelsa 类型3 过滤器之间的联系

    If the area range command has been configured for this area, type 3 LSAs that correspond to the area range are sent to all other areas, only if at least one prefix in the area range matches an entry in the prefix list. If all specific prefixes are denied by the prefix list, type 3 LSAs that correspond to the area range command will not be sent to any other area. Prefixes that are not permitted by  

    the prefix list are implicitly denied.――载自文档

    R1做汇总

    r1(config-router)#area 1 range 3.3.0.0 255.255.252.0

     

    r2#sho ip route | be Ga

    Gateway of last resort is not set

         2.0.0.0/24 is subnetted, 1 subnets

    C       2.2.2.0 is directly connected, Loopback0

         3.0.0.0/22 is subnetted, 1 subnets

    O IA    3.3.0.0 [110/129] via 12.1.1.1, 00:04:31, Serial2/0

         12.0.0.0/24 is subnetted, 1 subnets

    C       12.1.1.0 is directly connected, Serial2/0

         13.0.0.0/24 is subnetted, 1 subnets

    O IA    13.1.1.0 [110/128] via 12.1.1.1, 00:23:50, Serial2/0

     

    r1上增加几句 prefix-list3.3.0.0所有网段都排除

    r1(config)#ip prefix-list area1-out seq 11 deny 3.3.0.0/24

    r1(config)#ip prefix-list area1-out seq 12 deny 3.3.1.0/24

    r1(config)#ip prefix-list area1-out seq 13 deny 3.3.2.0/24

     

    查看r2路由表,那条汇总路由3.0.0.0/22 没有了

    r2#sho ip route | be Ga

    Gateway of last resort is not set

     

         2.0.0.0/24 is subnetted, 1 subnets

    C       2.2.2.0 is directly connected, Loopback0

         12.0.0.0/24 is subnetted, 1 subnets

    C       12.1.1.0 is directly connected, Serial2/0

         13.0.0.0/24 is subnetted, 1 subnets

    O IA    13.1.1.0 [110/128] via 12.1.1.1, 00:31:35, Serial2/0

    结论:如果所有明细的路由都被禁止了,汇总也会没掉

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