关键是对network这个命令的理解,The "network" command is a way of assigning an interface to a certain area.
可以做个实验:
!
interface FastEthernet0/0
ip address 12.1.1.201 255.255.255.248 secondary
ip address 12.1.1.2 255.255.255.248
这样配置后,其他的配置都不变,看一下路由表里有12.0.0.200/29的子网没有