If you have a seperate DHCP servers for different VLAN then by default the DHCP request from one VLAN will not go into any other VLAN as these requests are broadcast which will not cross the layer 3 boundary.
First of all if you want send the DHCP requests from on subnet (vlan) to another subnet, you need to point the dhcp server under specific vlan "ip helper xx.xx.xx.xx" So if you dont want send dhcp requests then you dont put the above "ip helper" command, if it is there then you can remove it from the vlan.
Hope the above helps you, if not please let us know the exact requirement.
Please rate all the helpfull posts. Regards, Naidu.
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