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Steps To Migrate Server 2008 Split Scope to 2012R2 Failover? RRS feed

  • Question

  • I found these instructions:

    https://technet.microsoft.com/en-us/library/dn338990.aspx?f=255&MSPPError=-2147217396

    It has some useful information, but if I were to follow those steps as written, it appears that we would have both the old a new DHCP servers running and handing out conflicting leases.


    Install the DHCP Server role on DHCP2012-1 and DHCP2012-2
    Export DHCP settings and leases from DHCP2008-1 and DHCP2008-2
    Import DHCP settings and leases to DHCP2012-1
    Import server level settings to DHCP2012-2
    Configure DHCP failover on DHCP2012-1
    Update DHCP relay agents and complete migration

    At what point are you supposed to disable or deauthorize the old DHCP servers?

    Wednesday, January 27, 2016 4:28 AM

Answers

  • Hi MyGposts,

    >> At what point are you supposed to disable or deauthorize the old DHCP servers?

    1.Disable the old DHCP server before the migrating, if you could.

    2.If the DHCP server must be working at any time, after you finished installing the DHCP Server role on DHCP2012-1 and DHCP2012-2, do not authorized new DHCP server to the Domain, do it when you finish the migrating and disable the old DHCP server first.

    Best Regards,

    Leo


    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Wednesday, January 27, 2016 8:07 AM
    Moderator
  • Hi

     You can follow the steps for dhcp migration,

     -cmd console "netsh dhcp server export c:\dhcpbackup.txt all" ->enter

    - stop dhcp service and set start up type "disabled" (you should disable this steps)

     copy "dhcpbackup.txt"file from source dhcp to target dhcp (on c dirve or etc)

    - install DHCP role on Server 2012 but do not configure or create any scope.

    - also check for is there any scope on 2012 "netsh dhcp server Show scope" if there is any "netsh dhcp server delete scope(ip of scope) dhcpfullforce" to delete

    - "netsh dhcp server import c:\dhcpbackup.txt all" (where the backup file avaible)

    -Finaly server manager->Tools->Open DHCP check the situation (if there is a red cross on,right click on dhcp server click "authorize" and "activate",

    For check authorize dhcp servers on domain run "Netsh dhcp show server" and if the old dhcp server in the list just delete it with run "netsh dhcp delete server dhcpsrv1.example.microsoft.com 10.2.2.2"


    This posting is provided AS IS with no warranties or guarantees,and confers no rights. Best regards Burak Uğur

    Wednesday, January 27, 2016 2:02 PM

All replies

  • Hi MyGposts,

    >> At what point are you supposed to disable or deauthorize the old DHCP servers?

    1.Disable the old DHCP server before the migrating, if you could.

    2.If the DHCP server must be working at any time, after you finished installing the DHCP Server role on DHCP2012-1 and DHCP2012-2, do not authorized new DHCP server to the Domain, do it when you finish the migrating and disable the old DHCP server first.

    Best Regards,

    Leo


    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Wednesday, January 27, 2016 8:07 AM
    Moderator
  • How do you disable the old dhcp server?  We cannot just disconnect it from the network because the server is still being used for other functions.

    I looks like authorizing the new dhcp controller is required or you can't import the dhcp settings from the old server.

    There must be some reason the steps are written the way they are in the Technet link I posted..

    Wednesday, January 27, 2016 1:27 PM
  • Hi

     You can follow the steps for dhcp migration,

     -cmd console "netsh dhcp server export c:\dhcpbackup.txt all" ->enter

    - stop dhcp service and set start up type "disabled" (you should disable this steps)

     copy "dhcpbackup.txt"file from source dhcp to target dhcp (on c dirve or etc)

    - install DHCP role on Server 2012 but do not configure or create any scope.

    - also check for is there any scope on 2012 "netsh dhcp server Show scope" if there is any "netsh dhcp server delete scope(ip of scope) dhcpfullforce" to delete

    - "netsh dhcp server import c:\dhcpbackup.txt all" (where the backup file avaible)

    -Finaly server manager->Tools->Open DHCP check the situation (if there is a red cross on,right click on dhcp server click "authorize" and "activate",

    For check authorize dhcp servers on domain run "Netsh dhcp show server" and if the old dhcp server in the list just delete it with run "netsh dhcp delete server dhcpsrv1.example.microsoft.com 10.2.2.2"


    This posting is provided AS IS with no warranties or guarantees,and confers no rights. Best regards Burak Uğur

    Wednesday, January 27, 2016 2:02 PM