实例:rip的secondary 地址

r1
inter s1
ip add 172.16.1.0 255.255.255.0
clock rate 64000
no shut
inter s0
ip add 172.16.2.1 255.255.255.0
clock rate 64000
no shut
router rip
net 172.16.0.0
r2
inter s1
ip add 172.16.2.2 255.255.255.0
no shut
inter s0
ip add 192.168.1.1 255.255.255.0
clock rate 64000
no shut
route rip
net 172.16.0.0
net 192.168.1.0
r3
inter s1
ip add 192.168.1.2 255.255.255.0
clock rate 64000
no shut
inter s0
ip add 172.16.3.1 255.255.255.0
clock rate 64000
no shut
router rip
net 192.168.1.0
net 172.16.0.0
r4
inter s1
ip add 172.16.3.2 255.255.255.0
clock rate 640000
no shut
inter s0
ip add 176.16.4.1 255.255.255.0
clock rate 64000
no shut
router router
net 172.16.0.

r2
inter s0
ip add 172.16.5.1 255.255.255.0
no shut
r3
inter s1
ip add 172.16.5.2 255.255.255.0
no shut