multiple Vlans and Microsoft DHCP server with multiple scopes

Question

_{Thursday, January 12, 2012 7:53 AM}

hi all

in our LAN ,we have some Vlans ( cisco switches ) and a Layer3 switch ( act as Router and DHCP Relay Agent )  and our DHCP server is microsoft DHSCP Server ( 2008 R2 ). 

can someone please describe me what steps and configuration should i do so that when clients from vlan1 ( 10.1.1.1\24) broadcast a dhcp discover , microsfot DHCP server offeres them ip address from his 10.1.1.0 scope ( and not from other scopes )

should our microsfot dhcp server , server NIC support .1x ( dot one x )(encapsulation protocol which adds vlan id tags to frames )?

thanks in advance

All replies (2)

_{Thursday, January 12, 2012 8:44 AM ✅Answered | 1 vote}

Hello,

just create scopes for the different VLANs and configure the DHCP relay agent on the router accordingly, so the relay agent for VLAN 10.1.1.1 send all to the DHCP server having th scope for it, that's it. Clients should then get the lease for the correct scope based on the relay agent.

Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

_{Thursday, January 12, 2012 8:49 AM ✅Answered | 1 vote}

Hi.

In reality you dont need to make very much configuration. When the Layer3 switch proxys the DHCP request to the DHCP server. It will include the "giaddr" so the DHCP server knows where to send the anwser, This also lets the DHCP server discover what net to give an address from.

Oscar Virot