BGP 路由反射器示例

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组网需求

  1. 8台路由器组建IBGP网络，Router B、Router D和Router E已经建立BGP全连接
  2. 要求：不破坏Router B、Router D和Router E全连接情况下组件IBGP网络，并尽可能简化设备的配置和管理

组网拓扑

配置思路

  1. 配置Router B作为Cluster 1的路由反射器，Router D和Router E是客户机，配置禁止客户间通讯
  2. 实现不破坏Router B、Router D和Router E全连接状态的情况下组件IBGP网络
  3. 配置Router C为Cluster 2的路由反射器，Router F和Router G为客户机，实现简化设备的配置和管理的需求

配置命令

  1. 配置各路由器基本功能以及各接口IP地址

    • Router A配置

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      sys
      sys Router A
      int g0/0/0
        ip add 10.1.1.2 30
      int g0/0/1
        ip add 10.1.3.2 30
      int LoopBack 0
        ip add 9.1.1.1 30
      int LoopBack 1
        ip add 1.1.1.1 32

  • Router B配置

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    sys Router B
    int g0/0/0
      ip add 10.1.1.1 30
    int g0/0/1
      ip add 10.1.4.1 30
    int g0/0/2
      ip add 10.1.5.1 30
    int g4/0/0
      ip add 10.1.2.1 32
    int LoopBack 0
      ip add 2.2.2.2 32

  • Router C配置

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    sys Router C
    int g0/0/0
      ip add 10.1.8.1 30
    int g0/0/1
      ip add 10.1.3.1 30
    int g0/0/2
      ip add 10.1.7.1 30
    int g4/0/0
      ip add 10.1.2.2 32
    int LoopBack 0
      ip add 3.3.3.3 32

  • Router D配置

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    sys Router D
    int g0/0/0
      ip add 10.1.6.1 30
    int g0/0/1
      ip add 10.1.4.2 30
    int LoopBack 0
      ip add 4.4.4.4 32

  • Router E配置

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    sys Router B
    int g0/0/0
      ip add 10.1.6.2 30
    int g0/0/2
      ip add 10.1.5.2 30
    int LoopBack 0
      ip add 5.5.5.5 32

  • Router F配置

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    sys Router F
    int g0/0/2
      ip add 10.1.7.2 30
    int LoopBack 0
      ip add 6.6.6.6 32

  • Router G配置

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    sys Router F
    int g0/0/0
      ip add 10.1.8.2 30
    int LoopBack 0
      ip add 7.7.7.7 32

  1. 配置IBGP协议

    • Router A配置

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      bgp 65010
       router-id 1.1.1.1
       peer 10.1.1.1 as-number 65010 
       peer 10.1.3.1 as-number 65010 
       #
       ipv4-family unicast
        undo synchronization
        peer 10.1.1.1 enable
        peer 10.1.3.1 enable

  • Router B配置

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    bgp 65010
     router-id 2.2.2.2
     peer 10.1.1.2 as-number 65010 
     peer 10.1.2.2 as-number 65010 
     peer 10.1.4.2 as-number 65010 
     peer 10.1.5.2 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.1.2 enable
      peer 10.1.2.2 enable
      peer 10.1.4.2 enable
      peer 10.1.5.2 enable

  • Router C配置

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    bgp 65010
     router-id 3.3.3.3
     peer 10.1.2.1 as-number 65010 
     peer 10.1.3.2 as-number 65010 
     peer 10.1.7.2 as-number 65010 
     peer 10.1.8.2 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.2.1 enable
      peer 10.1.3.2 enable
      peer 10.1.7.2 enable
      peer 10.1.8.2 enable

  • Router D配置

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    bgp 65010
     router-id 4.4.4.4
     peer 10.1.4.1 as-number 65010 
     peer 10.1.6.2 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.4.1 enable
      peer 10.1.6.2 enable

  • Router E配置

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    bgp 65010
     router-id 5.5.5.5
     peer 10.1.5.1 as-number 65010 
     peer 10.1.6.1 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.5.1 enable
      peer 10.1.6.1 enable

  • Router F配置

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    bgp 65010
     router-id 6.6.6.6
     peer 10.1.7.1 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.7.1 enable

  • Router G配置

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    bgp 65010
     router-id 7.7.7.7
     peer 10.1.8.1 as-number 65010 
     #
     ipv4-family unicast
      undo synchronization
      peer 10.1.8.1 enable

  1. 宣告路由

    • Router A配置

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      bgp 65010
        network 9.1.1.0 30
        netowrk 10.1.1.0 30
        network 10.1.3.0 30

  • Router B配置

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    bgp 65010
      network 10.1.1.0 30
      network 10.1.2.0 30
      network 10.1.4.0 30
      network 10.1.5.0 30

  • Router C配置

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    bgp 65010
      network 10.1.2.0 30
      netowrk 10.1.3.0 30
      network 10.1.7.0 30
      network 10.1.8.0 30

  • Router D配置

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    bgp 65010
      network 10.1.4.0 30
      network 10.1.6.0 30

  • Router E配置

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    bgp 65010
      network 10.1.6.0 30
      network 10.1.5.0 30

  • Router F配置

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    bgp 65010
      network 10.1.7.0 30

  • Router G配置

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    bgp 65010
      network 10.1.8.0 30

  1. 配置RR（Router Reflect）

    • Router B配置

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      bgp 65010
        group In_RouterRflector internal
        peer 10.1.4.2 group  In_RouterRflector
        peer 10.1.5.2 group  In_RouterRflector
        ipv4-family unicast
          peer In_RouterRflector reflect-client
          undo reflect between-clients
          reflector cluster-id 1

  • Router C配置

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    bgp 65010
      group In_RouterRflector internal
      peer 10.1.7.2 group  In_RouterRflector
      peer 10.1.8.2 group  In_RouterRflector
      ipv4-family unicast
        peer In_RouterRflector reflect-client
        undo reflect between-clients
        reflector cluster-id 2

结果查看

  1. 配置路由反射器之前的Router D到9.1.1.0 30 的BGP路由表

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    display bgp routing-table 9.1.1.1 30

    <Router D>display bgp routing-table 9.1.1.0 30
    Info: The network does not exist.
    # 原因是：Router A与Router D之间没有直连，也就是整个拓扑不是全连接的状态

  1. 配置路由反射器之后的Router D到9.1.1.0 30 的BGP路由表

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    display bgp routing-table 9.1.1.1 30

    <Router D>dis bgp routing-table 9.1.1.0 30

     BGP local router ID : 4.4.4.4
     Local AS number : 65010
     Paths:   1 available, 1 best, 1 select
     BGP routing table entry information of 9.1.1.0/30:
     From: 10.1.4.1 (2.2.2.2)
     Route Duration: 00h01m18s  
     Relay IP Nexthop: 10.1.4.1
     Relay IP Out-Interface: GigabitEthernet0/0/1
     Original nexthop: 10.1.1.2
     Qos information : 0x0
     AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, bes
    t, select, active, pre 255
     Originator:  1.1.1.1
     Cluster list: 0.0.0.1
     Not advertised to any peer yet
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