Move DHCP from a cisco 4507 to a server 08 box

I need to move the DHCP off of the switch and onto a server, this is to accomidate a SCMM install. What is the best way to do this without affecting my users for too long. I would like to make all the scopes on the sever, set up the reservation and once it is all done then go and flip the switch. I know I will need to remove the settings on the Cisco 4507 and then include a DHCP helper address. Does that address need to go on all the vlans or is it a global setting? If I leave off the helper address can I do all the configuring without bothering the users?
Kelly-BradyAsked:
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Rick_O_ShayCommented:
You will need to put the helper in for each interface to relay requests back to the server.
With the helper left off of the switch's interfaces the DHCP server will still reply to requests on its local VLAN
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Kelly-BradyAuthor Commented:
That should be fine since it is a server vlan and they all are statically assigned.
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Aaron StreetTechnical Infrastructure Architecture and Global Network ManagerCommented:
in which case just insure the server is set to check IP are not in use before it assigns them. (a little tick box on the server propries on the dhcp mmc) all it does is pings the address it is going to use to assign and if its in use marks it as bad.

you can then add the dhcp helper address in and check the server is leasing the correct addresses, you can have both running together and the server will only lease non used addresses (you will see bad addresses apearing in the leased list, becasue it sees them as in use)

once you are happy it is working remover the DHCP server from the switch and leave the helper address in place. you may have to pause the dhcp on the switch to check the server is working after you have added the ip helper addresses, becaue it will be the first to respond to the requests to the server might never get to reply in time.

once you have got the server running dhcp and the switch turned off, The bad addresses will slowly disappear as the leases run out and get renewed correctly by the server.

the ip helper address goes on to any routed interface for the remote  that acts as the default gate way for them.

and yes you can do all the config up front with out touching the users untill tte last miniute, and even then you can run them in tandom so the switch over is completely transparent.
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Kelly-BradyAuthor Commented:
Ok I have it all set up on the server minus the check box to have it check to see if it is in use. I have looked on the server properties and I did not see that option. I like the fact that they bot can run at the same time and then just faze ouit the old ones.
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Aaron StreetTechnical Infrastructure Architecture and Global Network ManagerCommented:
on 2008 may be on by default. or it might be on the scope options, but i know on 2003, you right click on the server and its on one of the tabs.

but yes you can have mutiply dhcp servers on one subnet, (as long as they both hand out the same address range and options.

the DHCP server will only hand out address to the subnet they come from. So if clients are on the same local subnet it will only hand out address is it has a scope in the same range as its own nic card address.

other wise the scopes must match the address ranges that are set on the interfaces you have dhcp helper address set up on,

http://jorgemederos.wordpress.com/2010/01/22/using-conflict-detection-in-dhcp/ heres how to enable conflict detection on 2008 look towards the bottom.
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Kelly-BradyAuthor Commented:
That worked great thank you!
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Rick_O_ShayCommented:
Kelly-Brady, I am a little disappointed that you chose to not at least split the points on this. The two questions you asked, "Does that address need to go on all the vlans or is it a global setting? If I leave off the helper address can I do all the configuring without bothering the users?" I answered for you.
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Kelly-BradyAuthor Commented:
Sorry I made a mistake and I did not look carefully enough, thought I was talking to the same person teh whole time. I do apoligize for me being rude and I do appreciate your help!
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Rick_O_ShayCommented:
I didn't think you were being rude but thanks for the comment.
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