DHCP: Splitting 10.10.120.0/23 between 2 servers, why exclude?

I understand that best practice is to split a scope between 2 dhcp servers on the same subnet. We have a rather larger subnet 10.10.120.0/23
Server1 with pool 10.10.120.50-10.10.120.230
Server2 with pool 10.10.121.50-10.10.121.230
What's the purpose of expanding the scope in each server and configuring exclusions? If each server have technically a different subnet, there will never be a conflict. I would like to know if there's any benefit to expand the range and add exclusions.
Server1 with pool 10.10.120.50-10.10.121.230 exclude 10.10.120.231-10.10.121.230
Server2 with pool 10.10.120.50-10.10.121.230 exclude 10.10.120.50-10.10.121.49

If this is your config:
Server1 with pool 10.10.120.50-10.10.120.230 /23
Server2 with pool 10.10.121.50-10.10.121.230 /23
Then those are NOT different subnets. Those are properly split DHCP scopes.
The subnet in this case is from 10.10.120.0 - 10.10.121.255 and that is what you're splitting.
For your second example:
Server1 with pool 10.10.120.50-10.10.121.230 exclude 10.10.120.231-10.10.121.230
Server2 with pool 10.10.120.50-10.10.121.230 exclude 10.10.120.50-10.10.121.49
This will give you problems:
1) The servers are offering the same IPs, they might even issue the same IP to two different devices because they won't know the other gave it away.
2) Server 1 has some exclusions that Server 2 won't know about. That means Server 2 will issue IPs from Server 1's exclusion range.
3) This is not a recommended setup.
- If you have found my post to be helpful, or the answer, please mark it appropriately.
Chris Ream

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DHCP: Splitting 10.10.120.0/23 between 2 servers, why exclude?

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