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GloriaGu-MSFT avatar image
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GloriaGu-MSFT asked CandyLuo-MSFT answered

DHCP Failover

Hi Team.

I have configured a DHCP Failover with windows 2012 R2 servers at 2 different sites. i have the below questions as to what happens when

  1. Once the Partner (passive server become active after MCLT expire and take control of whole range of scope), what happens when the primary server which was down has been brought back up , will it reverse the replication automatically ? will failed primary server brought back up start leasing out ip addresses without any manual intervention ?

  2. Is there any way or a script which will replicate any newly created scopes(as it does not replicate automatically) from Primary to Partner server ?


Thread source link: https://social.technet.microsoft.com/Forums/en-US/e031145a-3b63-45a8-9bf6-4fd999ef9357/dhcp-failover?forum=winserverNIS

windows-server-infrastructure
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1 Answer

CandyLuo-MSFT avatar image
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CandyLuo-MSFT answered

Hi ,

Welcome to our new Microsoft Q&A Platform.

1.Yes, primary server will attempt to reestablish communications with passive server and send binding acknowledgment (BNDACK) messages until the lease database is fully synchronized

Please refer to the link below:

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn338973(v%3dws.11)

2.You can use powershell Invoke-DhcpServerv4FailoverReplication to replicate scopes
Please refer to the link below:

https://docs.microsoft.com/en-us/powershell/module/dhcpserver/invoke-dhcpserverv4failoverreplication?view=win10-ps

https://blogs.technet.microsoft.com/teamdhcp/2012/11/27/automatic-syncing-of-scope-configuration-changes-between-2-dhcp-failover-servers/

Best Regards,

Candy

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