Switching to Native Mode with NT4 BDC

I currently have a mixed mode Windows 2000 AD domain with 3 2K DC’s and one NT4 BDC. I am wanting to switch to native mode. If I make the switch what will happen? Will that NT4 BDC continue to function and just not receive the domain replication info or will that server no longer be able to function on the domain? Thank you for your assistance.