BGP 团体属性示例

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组网需求

  1. Router B分别与Router A、Router C建立EBGP连接
  2. 要求：AS 10发布给AS 20的路由，不在发布给其他AS

配置BGP团体属性拓扑

BGP团体属性示例拓扑图

配置思路

  1. 在Router A上配置策略，发布No_Export团体属性
  2. 实现AS 10 的路由发布给AS 20后，不在发布给其他AS

配置命令

  1. 配置各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 200.1.2.1 30
      int LoopBack 0
        ip add 9.1.1.1 32
      int LoopBack 1
        ip add 1.1.1.1 32

  • Router B配置

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    sys
    sys Router B
    int g0/0/0
      ip add 200.1.2.2 30
    int g0/0/1
      ip add 200.1.3.1 30
    int g0/0/0
      ip add 2.2.2.2 32

  • Router C配置

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    sys
    sys Router C
    int g0/0/1
      ip add 200.1.3.2 30
    int LoopBack 0
      ip add 3.3.3.3 32

  1. 配置EBGP对等体

    • Router A配置

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      sys
      bgp 10
        router-id 1.1.1.1
        peer 10.1.2.2 as-number 20

  • Router B配置

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    sys
    bgp 20
      router-id 2.2.2.2
      peer 10.1.2.1 as-number 10
      peer 10.1.3.2 as-number 30

  • Router C配置

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    bgp 30
      router-id 3.3.3.3
      peer 10.1.3.1 as-number 20

  1. 发布路由

    • Router A配置

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      sys
      bgp 10
        ipv4-family unicast
          network 9.1.1.1 32

  1. 配置团体community团体属性

    • Router A配置

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      sys
      route-policy community_policy permit node 10
        aplly community no_export

  2. 在BGP中应用团体属性

    • Router A配置

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      sys
      bgp 10
        ipv4-family unicast
          peer 10.1.2.2 route-policy community_policy
          peer 10.1.2.2 advertise-community

查看结果

  1. 配置团体属性前的BGP路由表（以Router B为例）

    • 路由表

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      display bgp routing-table
          
      <Router B>display bgp routing-table 

       BGP Local router ID is 2.2.2.2 
       Status codes: * - valid, > - best, d - damped,
                     h - history,  i - internal, s - suppressed, S - Stale
                     Origin : i - IGP, e - EGP, ? - incomplete


       Total Number of Routes: 1
            Network            NextHop        MED        LocPrf    PrefVal Path/Ogn

       *>   9.1.1.1/32         200.1.2.1       0                     0      10i

  • 具体目的地址路由表

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    display bgp routing-table 9.1.1.1 32

    <Router B>display bgp routing-table 9.1.1.1 32

     BGP local router ID : 2.2.2.2
     Local AS number : 20
     Paths:   1 available, 1 best, 1 select
     BGP routing table entry information of 9.1.1.1/32:
     From: 200.1.2.1 (1.1.1.1)
     Route Duration: 00h10m03s  
     Direct Out-interface: GigabitEthernet0/0/0
     Original nexthop: 200.1.2.1
     Qos information : 0x0
     AS-path 10, origin igp, MED 0, pref-val 0, valid, external, best, select, activ
    e, pre 255
         # 宣告给邻居
     Advertised to such 2 peers:
        200.1.2.1
        200.1.3.2

  1. 配置团体属性后的BGP路由表（以Router B为例）

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    display bgp routing-table 9.1.1.1 32

    <Router B>display bgp routing-table 9.1.1.1 32

     BGP local router ID : 2.2.2.2
     Local AS number : 20
     Paths:   1 available, 1 best, 1 select
     BGP routing table entry information of 9.1.1.1/32:
     From: 200.1.2.1 (1.1.1.1)
     Route Duration: 00h00m03s  
     Direct Out-interface: GigabitEthernet0/0/0
     Original nexthop: 200.1.2.1
     Qos information : 0x0
     Community:no-export
     AS-path 10, origin igp, MED 0, pref-val 0, valid, external, best, select, activ
    e, pre 255
         # 未宣告给邻居
     Not advertised to any peer yet
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