路由引入时使用路由过滤策略示例

组网需求

  1. Router B与Router A之间通过OSPF协议交换路由信息,与Router C之间通过IS-IS协议交换路由信息
  2. 要求在Router B上将IS-IS网络中路由引入到OSPF网络后,OSPF网络中路由172.17.1.0/24的优先级较低
  3. 路由172.17.2.0/24具有标识,方便以后运用路由策略

组网拓扑

在路由引入时应用路由策略示例

配置思路

  1. 在Router B上配置路由策略,将172.17.1.0/24的路由的开销值设置为100,在OSPF引入IS-IS路由时应用路由策略
  2. 将172,。17.2.0/24的路由的Tag属性设置成20,实现路由172.17.2.0/24,方便以后运用路由策略

配置命令

  1. 配置路由器基本功能以及各个接口IP地址

    • Router A配置

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      sys
      sys Router A
      int g0/0/0
      ip add 192.168.1.1 30
      int LoopBack 0
      ip add 1.1.1.1 32
  • Router B配置

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    sys Router B
    int g0/0/0
    ip add 192.168.1.2 30
    int g0/0/1
    ip add 192.168.2.2 30
    int LoopBack 0
    ip add 2.2.2.2 32
  • Router C配置

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    sys Router C
    int g0/0/1
    ip add 192.168.2.1 30
    int LoopBack 0
    ip add 3.3.3. 32
  1. 配置OSPF协议

    • Router A配置

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      ospf 1 router-id 1.1.1.1
      area 0
      network 192.168.1.0 0.0.0.3
  • Router B配置

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    ospf 1 router-id 2.2.2.2
    area 0
    network 192.168.1.0 0.0.0.3
  1. 配置IS-IS协议

    • Router B配置

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      isis 1
      is-level level-2
      network-entity 86.0010.0020.0200.2002
      int g0/0/1
      isis enable 1
      isis small-hello
  • Router C配置

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    isis 1
    is-level level-2
    network-entity 86.0010.0030.0300.3003

    int g0/0/1
    isis enable 1
    isis small-hello
  1. 配置路由引入

    • Router B配置

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      isis 1
      import-route ospf 1

      ospf 1
      import-route isis 1
  • Router C配置

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    sys
    ip route-static 172.17.1.0 24 NULL 0
    ip route-static 172.17.2.0 24 NULL 0
    ip route-static 172.17.3.0 24 NULL 0

    isis 1
    import-route static
  1. 配置过滤器(Router B)

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    sys
    acl 2002
    rule 0 permit source 172.17.2.0 0.0.0.255
    q
    ip ip-prefix isis_2.0 index 1 permit 172.17.1.0 24
  1. 配置路由策略(Router B)

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    route-policy isis_to_ospf permit node 10
    if-match ip-prefix isis_2.0
    apply cost 100
    route-policy isis_to_ospf premit node 20
    if-match acl 2002
    apply tag 20
    route-policy isis_to_ospf permit node 30
  1. 应用路由策略(Router A)

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    ospf 1
    import isis 1 route-policy isis_to_ospf

查看结果

  1. 查看配置路由引入后的路由表

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    display ospf routing

    <Router A>dis ospf routing

    OSPF Process 1 with Router ID 1.1.1.1
    Routing Tables

    Routing for Network
    Destination Cost Type NextHop AdvRouter Area
    192.168.1.0/30 1 Transit 192.168.1.1 1.1.1.1 0.0.0.0

    Routing for ASEs
    Destination Cost Type Tag NextHop AdvRouter
    172.17.1.0/24 1 Type2 1 192.168.1.2 2.2.2.2
    172.17.2.0/24 1 Type2 1 192.168.1.2 2.2.2.2
    172.17.3.0/24 1 Type2 1 192.168.1.2 2.2.2.2
    192.168.2.0/30 1 Type2 1 192.168.1.2 2.2.2.2

    Total Nets: 5
    Intra Area: 1 Inter Area: 0 ASE: 4 NSSA: 0
  1. 查看应用路由策略后的路由表

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    display ospf routing

    <Router A>dis ospf routing

    OSPF Process 1 with Router ID 1.1.1.1
    Routing Tables

    Routing for Network
    Destination Cost Type NextHop AdvRouter Area
    192.168.1.0/30 1 Transit 192.168.1.1 1.1.1.1 0.0.0.0

    Routing for ASEs
    Destination Cost Type Tag NextHop AdvRouter
    172.17.1.0/24 100 Type2 1 192.168.1.2 2.2.2.2 //Cost值为100
    172.17.2.0/24 1 Type2 20 192.168.1.2 2.2.2.2 //Tag值为20
    172.17.3.0/24 1 Type2 1 192.168.1.2 2.2.2.2
    192.168.2.0/30 1 Type2 1 192.168.1.2 2.2.2.2

    Total Nets: 5
    Intra Area: 1 Inter Area: 0 ASE: 4 NSSA: 0
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