Microsoft Windows DHCP Server Failover Clustering high availability (HA).
Windows Server 2025 DHCP Failover provides high availability by synchronizing lease data and scopes between two servers, ensuring uninterrupted IP address assignment if one node fails. It supports load balancing or hot standby modes, automatically sharing client information to eliminate network downtime and service outages. Here are the key details regarding DHCP Failover in Windows Server 2025:
|| Core Features and Capabilities
__Two-Server Sync: Connects two DHCP servers to share scope data, leases, reservations, and settings.
__Modes of Operation:
_Hot Standby: One server is active; the partner takes over only if the primary fails.
_Load Balance: Both servers actively assign IPs based on a defined percentage split (default 50/50).
__Uninterrupted Service: Prevents network outages caused by single-server failure, critical for modern infrastructure.
__Automatic Replication: Scope settings, reservations, and lease info are synchronized.
|| Key Technical Aspects
__Maximum Client Lead Time (MCLT): Defines how long a partner server can issue leases without confirming with the main server.
__Authentication: Uses a shared secret to secure failover messages between servers.
__Management: Configurable via Server Manager, PowerShell, or DHCP MMC.
__Event Logging: State changes and transitions are tracked in the DHCP server Admin channel.
|| Benefits
__High Availability & Redundancy: Essential for reliable, continuous network operations.
__Simple Setup: Includes built-in wizards to create relationships quickly.
__Reduced Downtime: Minimizes disruptions during maintenance or server crashes.
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