配置GRE扩大网络跳数范围（RIP）示例

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组网需求

  1. Router A、Router B、Router C、Router D之间部RIP路由协议实现互通，Router A到Router D只有1跳，Cost值为1
  2. Router A、Router D之间没有直连，可以建立GRE隧道实现

组网拓扑

配置GRE扩大网络跳数范围拓扑图

配置思路

  1. Router A、Router B、Router C 之间运行RIP协议，实现路由器之间互联互通，RIP进程为1
  2. Router A与Router C之间配置GRE隧道
  3. Router A、Router C、Router D 之间运行RIP协议，进程为2

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 20.1.1.1 30

  • Router B配置

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    sys
    sys Router B
    int g0/0/0
      ip add 20.1.1.2
    int g0/0/1
      ip add 30.1.1.1 30

  • Router C配置

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    sys
    sys Router C
    int g0/0/1
      ip add 30.1.1.2 30
    int g0/0/2
      ip add 40.1.1.1 30

  • Router D配置

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    sys
    sys Router D
    int g0/0/2
      ip add 40.1.1.2 30

  1. 配置RIP协议，进程为1，实现Router A、Router B、Router C互通

    • Router A配置

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      sys
      rip 1
        version 2
        network 20.0.0.0

  • Router B配置

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    sys
    rip 1
      version 2
      network 20.0.0.0
      network 30.0.0.0

  • Router C配置

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    sys
    rip 1
      version 2
      network 30.0.0.0

  1. 配置Tunnel接口，隧道协议为GRE，配置接口IP、源地址、目的地址

    • Router A配置

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      sys
      int tunnel 0/0/0
        ip add 10.1.1.1 30
        tunnel-protocol gre
        source 20.1.1.1
        destination 30.1.1.2

  • Router C配置

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    sys
    int tunnel 0/0/0
      ip add 10.1.1.2 30
      tunnel-protocol gre
      source 30.1.1.2
      destination 20.1.1.1

  1. 配置RIP协议，进程为2，实现Router A、Router C、Router D互通

    • Router A配置

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      sys
      rip 2
        version 2
        network 10.0.0.0

  • Router C配置

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    sys
    rip 2
      version 2
      network 10.0.0.0
      network 40.0.0.0

  • Router D配置

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    sys
    rip 2
      version 2
      network 40.0.0.0

查看命令

  1. 查看Router A、Router B、Router C配置RIP协议后的路由表，进程为1

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    display ip routing-table 

    [Router A-rip-2]dis ip routing-table 
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Routing Tables: Public
             Destinations : 11       Routes : 11       

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           10.1.1.0/30  Direct  0    0           D   10.1.1.1        Tunnel0/0/0
           10.1.1.1/32  Direct  0    0           D   127.0.0.1       Tunnel0/0/0
           10.1.1.3/32  Direct  0    0           D   127.0.0.1       Tunnel0/0/0
           20.1.1.0/30  Direct  0    0           D   20.1.1.1        GigabitEthernet
    0/0/0
           20.1.1.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
           20.1.1.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
           30.1.1.0/30  RIP     100  1           D   20.1.1.2        GigabitEthernet
    0/0/0
          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

  1. 查看GRE隧道的连通性

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    ping -a 10.1.1.1 10.1.1.2

    <Router A>ping -a 10.1.1.1 10.1.1.2
      PING 10.1.1.2: 56  data bytes, press CTRL_C to break
        Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=255 time=30 ms
        Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=20 ms
        Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=30 ms
        Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=30 ms
        Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=30 ms

      --- 10.1.1.2 ping statistics ---
        5 packet(s) transmitted
        5 packet(s) received
        0.00% packet loss
        round-trip min/avg/max = 20/28/30 ms

  1. 查看Router A、Router C、Router D配置RIP协议，进程为2的路由表

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    display ip routing-table protocol rip

    <Router A>dis ip routing-table protocol rip
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Public routing table : RIP
             Destinations : 2        Routes : 2        

    RIP routing table status : <Active>
             Destinations : 2        Routes : 2

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           30.1.1.0/30  RIP     100  1           D   20.1.1.2        GigabitEthernet
    0/0/0
           40.1.1.0/30  RIP     100  1           D   10.1.1.2        Tunnel0/0/0

    RIP routing table status : <Inactive>
             Destinations : 0        Routes : 0

  1. 测试到Router A到Router D的连通性与路径

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    ping 40.1.1.2

    <Router A>ping 40.1.1.2
      PING 40.1.1.2: 56  data bytes, press CTRL_C to break
        Reply from 40.1.1.2: bytes=56 Sequence=1 ttl=254 time=50 ms
        Reply from 40.1.1.2: bytes=56 Sequence=2 ttl=254 time=30 ms
        Reply from 40.1.1.2: bytes=56 Sequence=3 ttl=254 time=40 ms
        Reply from 40.1.1.2: bytes=56 Sequence=4 ttl=254 time=40 ms
        Reply from 40.1.1.2: bytes=56 Sequence=5 ttl=254 time=50 ms

      --- 40.1.1.2 ping statistics ---
        5 packet(s) transmitted
        5 packet(s) received
        0.00% packet loss
        round-trip min/avg/max = 30/42/50 ms

    tracert 40.1.1.2

    <Router A>tracert 40.1.1.2

     traceroute to  40.1.1.2(40.1.1.2), max hops: 30 ,packet length: 40,press CTRL_C
     to break 

     1 10.1.1.2 30 ms  30 ms  20 ms 

     2 40.1.1.2 30 ms  40 ms  40 ms
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