DHCP Server redundancy

Hello,

I have 3 different plant, each have his own DHCP Server.
Each plant belong to a VLAN.

Plant 1:
VLAN 10 : 192.168.10.0 - 254
DHCP Server : 192.168.10.12

Plant 2:
VLAN 20 : 192.168.20.0 - 254
DHCP Server : 192.168.20.12

Plant 3:
VLAN 30 : 192.168.30.0 - 254
DHCP Server : 192.168.30.12

On the switch I specified : ip helper-address 192.168.x0.12 (ip of DHCP server).

How can I make redundancy with the DHCP Server if one of them crashed ? It's 2003 DHCP Server.

Thanks for your help.
croustimielAsked:
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BillConnect With a Mentor Commented:
Here are two methods to think about:

Split Scope DHCP servers - Have two DHCP servers with different scopes:
 1- Run the DHCP role on two servers.  If you like you can run DHCP on a virtual machine.
 2- Create separate scopes.  My preferred method is to create a scope on both servers that is the same but "Exclude" different ranges.  That gives you flexibility.  You can change exclusions but you can't change a DHCP scope once it's been created, you have to delete it and create a new one.

Example setting for one DHCP Scope, you can adapt this to your scope design:

DHCP_Server_A (will only give out addresses from 10.10.10.1 to 10.10.10.128)
Start IP     10.10.10.1
End IP       10.10.10.254

Address pool:  Address Range for Distribution (the same on both DHCP Servers)
Start IP     10.10.10.1
End IP       10.10.10.254

IP Addresses excluded from distribution (exclusions allow you to make changes in the future)
Start IP     10.10.10.129   (this will give out IP addresses from .1 to .128)
End IP       10.10.10.254
---

DHCP_Server_B(will only give out addresses from 10.10.10.129 to 10.10.11.254)
Start IP     10.10.10.1
End IP       10.10.10.254

Address pool:  Address Range for Distribution (the same on both DHCP Servers)
Start IP     10.10.10.1
End IP       10.10.10.254

IP Addresses excluded from distribution (exclusions allow you to make changes in the future)
Start IP     10.10.10.1   (this will give out IP addresses from .129 to .255)
End IP       10.10.10.128

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Second option - Clustered DHCP server - You can cluster DHCP but the requirements to setup a cluster may not be practical (Windows 2008 R2 clustering is much easier though)
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croustimielAuthor Commented:
Thanks
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