windows server dhcp server and cisco switches

hi,

i have 2003 dc running dhcp using ip-helper for multiple vlans on cisco switches.  there is domain trust between 2003 dc domain and new 2008 domain.  I want the 2008 to be dhcp server.

will i have to make the change over out of hours to avoid ip conflicts?  and what is best process.?

thanks

phil
philipfarnesAsked:
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Chris HConnect With a Mentor Infrastructure ManagerCommented:
yes, you will need to de-authorize the old and re-authorize the new.

Make sure to staticly set the 2008 server outside your lease range. (Duh)
After hours on a Friday (leases are set to 14400 mins ~ 24hrs by default)
Authorize the new 2008 DHCP server.
De-Authorize the 2003.
Wait 24 hours.
Validate that the 2008 server is issuing DHCP leases in DHCP console.

If you can't wait 24 hours or your biz is 7x24, you should issue a remote reboot or throw a ipconfig /renew into your logon script (only if user is local admin)
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pcchiuCommented:
You can simple set up the 2008 with another usable DHCP ip range then once the 2008 DHCP is up turn off the 2003 DHCP service.   Once all workstation on the new DHCP then remove/uninstall the old DHCP service completely.

Which you can perform it at anytime.
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philipfarnesAuthor Commented:
can you confirm how to create windows 2008 dhcp for different vlans on cisco switches?  plus can i do one van at a time?

thanks

phil
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Chris HInfrastructure ManagerCommented:
http://www.cisco.com/en/US/docs/ios/12_4t/ip_addr/configuration/guide/htdhcpre.html

As always, with Cisco, you got a lot of reading to do. :P

And yes, you can do one vlan at a time.
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BillBondoCommented:
Would it not be easier to move the dhcp database to the new server?
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Chris HInfrastructure ManagerCommented:
@ bill, Yes.  He would still need to configure the relay agents on the switches in order to work with the new IP address of the server.  

I would only recommend this if you have an unusually large number of DHCP reservations.
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