Server Failover via Network Packet Filtering Isolation

The patent extracts the isolation function from the power supply control device and implements it through network layer packet filtering. The standby server sends isolation requests to terminal apparatuses to block network communication with the faulty server, eliminating the need for complex power supply control mechanisms while maintaining reliability.

The patent replaces the mechanical power supply control system with a network-based packet filtering mechanism. Instead of controlling physical power supply, the system uses network protocol-level isolation to disconnect the faulty server, achieving faster response time and simpler implementation.

The patent substitutes power supply-based failover with network protocol-based failover. The standby server detects faults and immediately initiates packet filtering isolation, eliminating the time-consuming power supply shutdown procedures and achieving rapid server switching.

The patent implements preliminary network isolation actions before complete failover. The standby server sends isolation requests to terminal apparatuses to pre-block network communication paths, enabling faster switching by preparing isolation mechanisms in advance rather than waiting for power supply procedures to complete.

The patent implements a feedback mechanism where the standby server receives responses from terminal apparatuses regarding isolation request execution. This feedback loop ensures that network isolation is properly established and confirms that the faulty server is effectively disconnected, preventing double active operation while maintaining fast switching.

The patent introduces terminal apparatuses as intermediaries between the standby server and the faulty server. These intermediaries execute packet filtering to block network communication, ensuring reliable isolation without requiring direct control of the faulty server's power supply, thus preventing double active operation while enabling fast switching.