DHCP Migration from 2k3 to 2k12R2, from splitscopes to dhcpfailover - how to merge scopes

Hi all,

We have currently 2 DHCP Servers based on 2k3 Server.
There's split scopes implemented, means:



=> Scope is the same, means Subnet .5

We want to upgrade them to 2k12R2 (new install) and merge the scopes (adress ranges, leases, reservations)
to one of These 2 new Servers, afterwards activate dhcp Failover hotstandby.

My Problem is now:
1.) I exported the dhcp Details successfully via netsh from 2k3 Server
2.) i imported the dhcp Details successfully via netsh Import on the 2k12r2 dhcp Server
3.) when i try to Import (Goal is to merge the Details) in 2k12r2 now with the netsh command, i got an error
that the scopes already exist and scope will not be imported.

So far i can understand that.
How can i proceed to successfully merge the split-scope conception into one dhcp Server?

Any idea?

teggraSystem EngineerAsked:
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Joseph DalyCommented:
With the split scope are you allowing the DHCP server to lease the full range and then using excusions to determine which scope each DHCP server can provide? If so then you should only need to import the DHCP settings from one of your servers and then delete the exclusion ranges.
teggraSystem EngineerAuthor Commented:
Hi Daly,
That would be the easy way yes, but my customer has splitted the adress ranges manually
e.g. Server 1 from 1-10, Server 2 from 11-20 regarding the adress range.
No exclusions.

I assume there's only 1 way to fix that:

Create an XML file and copy maually the leases over.
I tested that already with a test case - worked fine.
It's just a bit of work ... depends on the amount of scopes (177 in my case...)

teggraSystem EngineerAuthor Commented:

1) exported both dhcp scopes to a export file via netsh
2) imported them each in w2k12 testlab via n tsh(separately)
3) exported both scopes via powershell to a xml file
4) combined the scopes into one file (copy leases, reservations and so on)
5) imported into the production dhcp and enabled failover dhcp


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teggraSystem EngineerAuthor Commented:
solved as describe
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