Moving to DHCP 80/20

**Note These suggestions are based on experiences with a DHCP Appliance and not Windows DHCP Services**

I would move a whole scope at a time as opposed to pieces of the whole from my recent experiences. Since you are using a different IP address for your server, the clients will still attempt to renew their IP address on the old server after the TTL expires. When the addresses are no longer active on that server, the client will initiate a new DHCP Request and get an IP address from which ever relay device answers. If you are trying to use all three at the same time, DHCP1 might reply before 2 or 3.

 If you want to ensure these clients get he same IP address, you may need to do MAC based Reservation for each host else it will hand out the addresses as the DHCP Server sees fit.

I've requested that this question be deleted for the following reason:

Thanks for responding, unfortunatily my question was not answered, but it's OK since we have decided to go on another direction and change the IP address subnets so no conflict is expected anyway.

I think the question was answered.  Just because the OP did not choose the follow our advise does not mean it wasn't answeres.   If the answer was just simply not what he wanted to hear, then that is an entirely different thing.

Thanks Pwindell for your feedback,

The question was not for you to provide solutions, the question was if you have done a similar change and did you end up having any downtime:

To explain, here is a quote from my question, if you can answer it I will consider it answered:
{
We are trying to decide whether we need a maintenance window for our 24/7 1000 node environment.
Let’s say the scope 192.168.1.0 is already leased to DHCP clients by DHCP1, so we come and exclude it from DHCP1 and Add it to DHCP2 and DHCP3 (80/20) should we expect any interruptions or conflicts for the clients with such a move? Or is it gonna be completely transparent for the clients.

Any one can share a previous experience for a similar change?
}


So:
1) do we need a maintanance window?
2) should we expect any interruptions or conflicts for the clients with such a move? Or is it gonna be completely transparent for the clients.
3) Did you have a previous experience for a similar change that you can share (i.e. did you split a scope)?

I covered #1 and #2.  I did not mention anything about #3 although I have done it myself

At least that is the way I viewed what I was writing.

Thanks