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Configure Windows DHCP for Cisco Switch Vlans

In most environments nowadays, they use VLANs on Switches.
I would like to know, after creating VLANs , then on Windows DHCP I want to create Scopes for each VLAN. How do DHCP Scopes Map to VLANs, i mean if a workstation is automatically assigned IP 192.168.15.70/24, but the Network cable that connect the workstation to the switch port is going to a port in VLAN 20. I want the third octet of the IP of the workstation to match the VLAN number. in the Example above the workstation should be connected to Vlan 15

Any help will be very much appreciated.

Thank you

SOLUTION

Craig Beck

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jskfan

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When you plug a workstation into a port in VLAN 20, does that workstation tell DHCP that I am in VLAN 20 and please give me IP address from the scope 192.168.20.0 ?

I am not familiar with giaddr field..

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Craig Beck

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Hassan Besher

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jskfan

ASKER

OK… IP helper address is the one that knows from which VLAN the client request is coming from and add the info of the VLAN to giaddr field, then windows DHCP server reads giaddr and determine which appropriate scope will hand out IP address from back to the client…

in the case I have one switch in the LAB with one VLAN only , but multiple DHCP scopes on the windows server , there is no need for IP helper address… in this scenario I believe DHCP server will not hand out and IP address from any scope except if there is one on the same subnet as DHCP server itself is on…….. I could be wrong ???

jskfan

ASKER

Thank you Guys!