IS-IS等价路由示例

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组网需求

  1. R1、R2、R3运行IS-IS路由协议
  2. R1通过R1->R3访问R3的环回地址，也可以通过R1->R2->R3访问R3的环回地址
  3. 实现负载均衡和配置等价路由的优先级

组网拓扑

IS-IS等价路由拓扑图

配置思路

  1. 配置路由器基本功能以及各个接口IP地址
  2. 配置IS-IS协议，并在各个接口使能IS-IS协议
  3. 配置各个接口开销值，确保有一对等价路由，并配置最大负载均衡数量
  4. 配置接口的权重，实现等价路由的优选

配置命令

  1. 配置路由器基本功能以及各个接口IP地址

    • R1配置

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      sys
      sys R1
      int g0/0/0
        ip add 10.1.13.1 30
      int g0/0/1
        ip add 10.1.12.1 30

  • R2配置

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    sys
    sys R2
    int g0/0/1
      ip add 10.1.12.2 30
    int g0/0/2
      ip add 10.1.23.1 30

  • R3配置

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    sys
    sys R3
    int g0/0/0
      ip add 10.1.13.2 30
    int g0/0/2
      ip add 10.1.23.2 30
    int LoopBack 0
      ip add 10.1.3.3

  1. 配置IS-IS协议，并在各个接口使能IS-IS协议

    • R1配置

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      sys
      isis 1
        network-entity 49.0010.0100.0100.1001.00

      int g0/0/0
        isis enable 1
        isis small-hello
      int g0/0/1
        isis enable 1
        isis small-hello

  • R2配置

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    sys
    isis 1
      network-entity 49.0010.0100.0200.2002.00
      
    int g0/0/1
      isis enable 1
      isis small-hello
    int g0/0/2
      isis enable 1
      isis small-hello

  • R3配置

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    sys
    isis 1
      network-entity 49.0010.0100.0300.3003.00
      
    int g0/0/0
      isis enable 1
      isis small-hello
    int g0/0/2
      isis enbale 1
      isis small-hello

  1. 配置各个接口开销值，确保有一对等价路由，并配置最大负载均衡数量

    • R1配置

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      sys
      int g0/0/0
        isis cost 10
      int g0/0/1
        isis cost 5

  • R2配置

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    sys
    int g0/0/1
      isis cost 5
    int g0/0/2
      isis cost 5

  • R3配置

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    sys
    int g0/0/0
      isis cost 10
    int g0/0/1
      isis cost 5

  1. 配置接口的权重，实现路由选路的优先级

    • R1配置

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      sys
      isis 1
        nexthop 10.1.13.2 weight 1
        nexthop 10.1.12.2 weight 2

  • 查看结果

  1. 查看等价路由

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    display ip routing-table

    <R1>display ip routing-table 
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Routing Tables: Public
             Destinations : 12       Routes : 13       

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           10.1.3.3/32  ISIS-L2 15   10          D   10.1.12.2       GigabitEthernet
    0/0/1
                        ISIS-L2 15   10          D   10.1.13.2       GigabitEthernet
    0/0/0
          10.1.12.0/30  Direct  0    0           D   10.1.12.1       GigabitEthernet
    0/0/1
          10.1.12.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.12.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.13.0/30  Direct  0    0           D   10.1.13.1       GigabitEthernet
    0/0/0
          10.1.13.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
          10.1.13.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
          10.1.23.0/30  ISIS-L1 15   10          D   10.1.12.2       GigabitEthernet
    0/0/1
          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. 查看设置优先级后的路由表

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    display ip routing-table

    <R1>display ip routing-table
    Route Flags: R - relay, D - download to fib
    ------------------------------------------------------------------------------
    Routing Tables: Public
             Destinations : 12       Routes : 12       

    Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

           10.1.3.3/32  ISIS-L2 15   10          D   10.1.13.2       GigabitEthernet
    0/0/0
          10.1.12.0/30  Direct  0    0           D   10.1.12.1       GigabitEthernet
    0/0/1
          10.1.12.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.12.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/1
          10.1.13.0/30  Direct  0    0           D   10.1.13.1       GigabitEthernet
    0/0/0
          10.1.13.1/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
          10.1.13.3/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
    0/0/0
          10.1.23.0/30  ISIS-L1 15   10          D   10.1.12.2       GigabitEthernet
    0/0/1
          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
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