DHCP failover and syncing reservations

Danny Muchmore 0 Reputation points
2021-03-16T17:21:19.327+00:00

I am going to configure DHCP failover using a hot standby model. I realize DHCP reservations and static entries when created on the primary DHCP server will be replicated to the hot standby using the powershell DHCP failover auto config upon deployment. What happens to changes made to the original scopes or primary DHCP server after rollout? What changes will not be replicated during this process from the primary DHCP server?

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Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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  1. Candy Luo 12,656 Reputation points Microsoft Vendor
    2021-03-17T03:23:22.17+00:00

    Hi ,

    What happens to changes made to the original scopes or primary DHCP server after rollout? What changes will not be replicated during this process from the primary DHCP server?

    I am a bit confused about what you mean, could you please clarify more details?

    For Reservations , you can also manually replicate it. Right click IPv4 and select Replicate Failover Scopes.

    78470-image.png

    However, for server-level configurations, there is no way to sync it. e.g.: server policies and Filters. As a workaround, you can use PowerShell cmdlet to add it: 

    Get-DhcpServerv4Filter -List Allow -ComputerName myserver.FQDN | Add-DhcpServerv4Filter -Force

    The similar thread has discussed before, you could have a look:

    DHCP with failover automatic synchronization issue

    syncing dhcp policies between failover hosts

    Best Regards,

    Candy

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