上章简单讲解了ISIS基本配置，本章继续详细讲解ISIS配置及实施
IS-IS配置拓扑
1、R1进行配置IS-IS
[R1]display current-configuration configuration isis
isis 1
network-entity 49.0124.1111.1111.1111.00 //配置NET地址，由三部分组成，区域ID、系统ID和固定的SEL 00
interface Serial1/0/0
link-protocol ppp
ip address 12.1.1.1 255.255.255.0
isis enable 1//接口下开启IS-IS协议
[R1-LoopBack0]isis enable
2、R2进行配置IS-IS
[R2-isis-1]network-entity 49.0124.2222.2222.2222.00
[R2-Serial1/0/0]isis enable
[R2-LoopBack0]isis enable
3、R4进行配置IS-IS
[R4-isis-1]network-entity 49.0124.4444.4444.4
