实验图在上个文档：
1.基本配置
R1:
en
conf
host R1
int lo1
ip add 172.16.1.1 255.255.255.0
ip router isis
int lo2
ip add 172.16.2.1 255.255.255.0
ip router isis
int lo3
ip add 172.16.3.1 255.255.255.0
ip router isis
int f0/0
ip add 10.1.1.1 255.0.0.0
no sh
ip router isis
exit
router isis
net 49.0001.0000.0000.0001.00
R2:
en
conf
host R2
int f0/0
ip add 10.1.1.2 255.0.0.0
no sh
ip router isis
int s1/0
ip add 20.1.1.1 255.0.0.0
ip router isis
no sh
exit
router isis
net 49.0001.0000.0000.0002.00
R3:
en
conf
host R3
int lo1
ip add 172.17.1.1 255.255.255.0
ip router isis
int lo2
ip add 172.17.2.1 255.255.255.0
ip router isis
int lo3
ip add 172.17.3.1 255.255.255.0
ip router isis
int s1/0
ip add 20.1.1.2 255.0.0.0
ip router isis
no sh
int f0/0
ip add 30.1.1.1 255.0.0.0
ip router isis
no sh
exit
router isis
net 49.0002.0000.0000.0003.00
R4:
en
conf
host R4
int f0/0
ip add 30.1.1.2 255.0.0.0
ip router isis
no sh
int s/0
ip add 40.1.1.1 255.0.0.0
ip router isis
no sh
exit
router isis
net 49.0002.0000.0000.0004.00
R5:
en
conf
host R5
int s1/0
ip add 40.1.1.2 255.0.0.0
ip router isis
no sh
int lo1
ip add 172.18.1.1 255.255.255.0
ip router isis
int lo2
ip add 172.18.2.1 255.255.255.0
ip router isis
int lo3
ip add 172.18.3.1 255.255.255.0
ip router isis
exit
router isis
net 49.0003.0000.0000.0005.00
2.优化-修改路由器级别
R1：
router isis
is-type level-1
修改ISIS接口级别
R2:int s1/0
isis circuit-type level-2-only
int f0/0
ip router isis
isis circuit-type level-1
路由汇总
R2:
router isis
summary-add 172.16.0.0 255.255.0.0
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