system-view
Enter system view, return user view with Ctrl+Z.
[H3C]interface Eth0/0/0
[H3C-Ethernet0/0/0]ip address 172.30.100.1 24 #这个也可以这样配置:[H3C-Ethernet0/0/0]ip address 172.30.100.1 255.255.255.0
[H3C-Ethernet0/0/0]undo shutdown
Info: Interface Ethernet0/0/0 is not shutdown.
[H3C-Ethernet0/0/0]