BGP 联盟示例

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组网需求

  1. AS 200中有多台BGP路由器，现需要减少IBGP的连接数

组网拓扑

配置思路

  1. 在AS200中各路由器上配置BGP联盟
  2. 将设备划分为3个子自治系统：AS 65001、AS 65002、AS 65003
  3. AS65001内的三台路由器是IBGP全连接
  4. 实现减少IBGP的连接的需求

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 RouterA
      int g0/0/0
        ip add 10.1.3.1 30
      int g0/0/1
        ip add 10.1.4.1 30
      int g0/0/2
        ip add 10.1.1.1 30
      int g3/0/0
        ip add 10.1.2.1 30
      int g4/0/0
        ip add 200.1.1.1 30
      int LoopBack 0
        ip add 1.1.1.1 32

  • Router B配置

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    sys
    sys RouterB
    int g0/0/0
      ip add 10.1.1.2 30
    int LoopBack 0
      ip add 2.2.2.2 32

  • Router C配置

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    sys
    sys Router C
    int g0/0/0
      ip add 10.1.2.2 30
    int LoopBack 0
      ip add 3.3.3.3 32

  • Router D配置

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    sys
    sys RouterD
    int g0/0/0
      ip add 10.1.3.2 30
    int g0/0/2
      ip add 10.1.5.1 30
    int LoopBack 0
      ip add 4.4.4.4 32

  • Router E配置

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    sys
    sys RouterE
    int g0/0/1
      ip add 10.1.4.2 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
    sys Router F
    int g0/0/0
      ip add 200.1.1.2 30
    int LoopBack 0
      ip add 9.1.1.1 32
    int LoopBack 1
      ip add 6.6.6.6 32

  1. 配置BGP联盟

    • Router A配置

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      sys
      bgp 650001
        router-id 1.1.1.1
        confederation id 200
        confederation peer-as 65002 65003
        peer 10.1.1.2 as-number 65002
        peer 10.1.2.2 as-number 65003
        
        ipv4-family unicast
          peer 10.1.1.2 next-hop-local
          peer 10.1.2.2 next-hop-local

  • Router B配置

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    sys
    bgp 65002
      router-id 2.2.2.2
      confederation id 200
      confederation peer-as 65001
      peer 10.1.1.1 as-number 65001
      
      ipv4-family unicast
        peer 10.1.1.1 next-hop-local

  • Router C配置

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    sys
    bgp 65003
      router-id 3.3.3.3
      confederation id 200
      confedetation peer-as 65001
      peer 10.1.2.2 as-number 65001
      
      ipv4-family unicast
        peer 10.1.2.2 next-hop-local

  1. 配置AS 65001内的IBGP

    • Router A配置

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      sys
      bgp 65001
        peer 10.1.4.2 as-number 65001
        peer 10.1.3.2 as-number 65001
        ipv4-family unicast
          peer 10.1.3.2 next-hop-local
          peer 10.1.4.2 next-hop-local

  • Router D配置

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    sys
    bgp 65001
        router-id 4.4.4.4
        confederation id 200
        peer 10.1.3.1 as-number 65001
        peer 10.1.5.2 as-number 65001

  • Router E配置

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    sys
    bgp 65001
        router-id 5.5.5.5
        confederation id 200
        peer 10.1.4.1 as-number 65001
        peer 10.1.5.1 as-number 65001

  1. 配置EBGP并宣告Router F的路由

    • Router A配置

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      sys
      bgp 65001
          peer 200.1.1.2 as-number 100

  • Router B配置

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    sys
    sys Router F
    bgp 100
        router-id 6.6.6.6
        peer 200.1.1.1 as-number 200
        
        ipv4-family unicast
        	network 9.1.1.1 32

结果查看

  1. 查看BGP路由表（以Router B为例）

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    display bgp routing-table

    <Router B>dis 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

     *>i  9.1.1.1/32         10.1.1.1        0          100        0      (65001) 100i

  1. 查看到9.1.1..1 32 的BGP路由表

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    display bgp routing-table 9.1.1.1 32

    <Router B>dis bgp routing-table 9.1.1.1 32

     BGP local router ID : 2.2.2.2
     Local AS number : 65002
     Paths:   1 available, 1 best, 1 select
     BGP routing table entry information of 9.1.1.1/32:
     From: 10.1.1.1 (1.1.1.1)
     Route Duration: 01h13m54s  
     Relay IP Nexthop: 0.0.0.0
     Relay IP Out-Interface: GigabitEthernet0/0/0
     Original nexthop: 10.1.1.1
     Qos information : 0x0
     AS-path (65001) 100, origin igp, MED 0, localpref 100, pref-val 0, valid, exter
    nal-confed, best, select, active, pre 255
     Not advertised to any peer yet
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