OSPF 路由控制-过滤Type 3 LSA示例

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组网需求

  1. 组网中有R1、R2、R3三个路由器，R1、R2属于核心区域，R2、R3属于Area 1
  2. 过滤区域1内的Type 3 LSA

组网拓扑

OSPF路由控制-过滤Type 3 LSA

配置思路

  1. 配置路由器基本功能以及各个接口IP地址
  2. 配置OSPF路由协议，宣告路由
  3. 在ABR设备上配置过滤Type 3 LSA
  4. 在ABR设备上配置缺省路由

配置命令

  1. 配置路由器基本功能以及各个接口IP地址

    • R1配置

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      sys
      sys R1
      int g0/0/0
        ip add 10.1.12.1 30

  • R2配置

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    sys
    sys R2
    int g0/0/0
      ip add 10.1.12.2 30
    int g0/0/1
      ip add 10.1.23.1 30

  • R3配置

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    sys
    sys R3
    int g0/0/1
      ip add 10.1.23.2 30
    int LoopBack 0
      ip add 10.1.3.3

  1. 配置OSPF路由协议，宣告路由

    • R1配置

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      sys
      ospf 1 router-id 10.1.1.1
        area 0
          network 10.1.12.0 0.0.0.3

  • R2配置

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    sys
    ospf 1 router-id 10.1.2.2
      area 0
        network 10.1.12.0 0.0.0.3
      area 1
        network 10.1.23.0 0.0.0.3

  • R3配置

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    ospf 1  router-id 10.1.3.3
      area 1
        network 10.1.23.0 0.0.0.3
        network 10.1.3.3 0.0.0.0

  1. 过滤Type 3 LSA

    • R2配置

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      sys
      acl 2000
        rule 1 deny
        quit
      ospf 1
        aera 1
          filter 2000 import

  2. 如果要实现路由互通，需要在R2配置默认路由

    • R2配置

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      ospf 1
        default-route-advertise always

查看结果

  1. 查看未过滤前R3的路由表以及LSDB

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    display ip routing-table

    <R3>display ip routing-table 
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Routing Tables: Public
             Destinations : 9        Routes : 9        

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           10.1.3.3/32  Direct  0    0           D   127.0.0.1       LoopBack0
          10.1.12.0/30  OSPF    10   2           D   10.1.23.1       GigabitEthernet
    0/0/1
          10.1.23.0/30  Direct  0    0           D   10.1.23.2       GigabitEthernet
    0/0/1
          10.1.23.2/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.23.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0
          127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0
    127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0
    255.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0

    display ospf lsdb

    <R3>display ospf lsdb

    	 OSPF Process 1 with Router ID 10.1.3.3
    		 Link State Database 

    		         Area: 0.0.0.1
     Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
     Router    10.1.3.3        10.1.3.3            47  48    80000006       1
     Router    10.1.2.2        10.1.2.2            48  36    80000004       1
     Network   10.1.23.2       10.1.3.3            47  32    80000001       0
     Sum-Net   10.1.12.0       10.1.2.2            48  28    80000001       1

  1. 查看过滤后R3的路由表以及LSDB

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    display ip routing-table

    <R3>display ip routing-table
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Routing Tables: Public
             Destinations : 8        Routes : 8        

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           10.1.3.3/32  Direct  0    0           D   127.0.0.1       LoopBack0
          10.1.23.0/30  Direct  0    0           D   10.1.23.2       GigabitEthernet
    0/0/1
          10.1.23.2/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.23.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0
          127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0
    127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0
    255.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0

    display ospf lsdb

    <R3>display ospf lsdb

    	 OSPF Process 1 with Router ID 10.1.3.3
    		 Link State Database 

    		         Area: 0.0.0.1
     Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
     Router    10.1.3.3        10.1.3.3           131  48    80000006       1
     Router    10.1.2.2        10.1.2.2           132  36    80000004       1
     Network   10.1.23.2       10.1.3.3           131  32    80000001       0
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