adding new ip

UNIX AIX
1

Hi Admins,

I was told to add new ip,mask and gateway to my 3rd nic.so i prepared a plan doing the same via smitty. now i need to know do i plumb and unplumb before adding ip.
plz suggest

Regards
newaix

2 
#smitty mktcpip

Is all what you need

#chdev -l en2 -a state=down

#chdev -l en2 -a state=up