1、构建ISIS实验拓扑图
2、接下来配置路由器，首先配置路由器接口ip，然后配置路由器的IS-IS
以R1为例，具体的命令如下：
<Huawei>
<Huawei>sys /进入系统视图的命令简写
[Huawei]un in e /去掉提示信息
[Huawei]sys R1 /修改设备名称
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 10.0.12.1 24
[R1-GigabitEthernet0/0/0]quit
/配置路由器的IS-IS基本功能
[R1]isis
[R1-isis-1]network-entity 10.0000.0000.0001.00
[R1-isis-1]quit
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]isis enable
[R1-GigabitEthernet0/0/0]quit
[R1]
3、R2、R3的配置与R1一致，具体命令如下：
R2：
<Huawei>sy
[Huawei]un in e
[Huawei]sys R2
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 10.0.12.2 24
[R2-GigabitEthernet0/0/0]int g0/0/1
[R2-GigabitEthernet0/0/1]ip add 10.0.23.2 24
[R2-GigabitEthernet0/0/1]quit
[R2]isi
[R2-isis-1]network-entity 10.0000.0000.0002.00
[R2-isis-1]quit
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]isis enable
[R2-GigabitEthernet0/0/0]int g0/0/1
[R2-GigabitEthernet0/0/1]isis enable
[R2-GigabitEthernet0/0/1]quit
[R2]
R3：
<Huawei>sy
[Huawei]un in e
[Huawei]sys R3
[R3]int g0/0/
[R3-GigabitEthernet0/0/1]ip add 10.0.23.3 24
[R3-GigabitEthernet0/0/1]quit
[R3]isis
[R3-isis-1]net
[R3-isis-1]network-entity 10.0000.0000.0003.00
[R3-isis-1]qui
[R3]int g0/0/1
[R3-GigabitEthernet0/0/1]isis enable
[R3-GigabitEthernet0/0/1]quit
[R3]
4、最后在R1和R2上使用display isis route命令进行验证；另外路由器R1通过ping命令可以ping 通R2和R3。
