Secondary domain controller 2012R2

Hi,

I have a domain with windows server 2012R2. My network has 7 vlans and I want to bring some redundancy in my network by adding a secondary domain controller. The secondary domain controller will also be server 2012R2. I like to know if I have to make some preperations to the secondary domain controller for letting it be completely functional.

The first domain controller has 7 virtual lan cards (multi homed). Do I first have to add the same virtual cards to the secondary domain controller and add the dhcp ranges or do I only have to follow the staps according to add the secondary domain controller?

Thank you for your help!