Switch IP Address Redundancy for Network Failover
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Solution Overview
Problem
In networks with redundant devices, managing routing effectively is challenging due to topology constraints and traffic disruption time constraints, especially when redundant network devices share the same IP address, making it difficult to determine which device is active and switch traffic seamlessly.
Innovation Solution
A method involving a switch connected to redundant network devices, where a notification is received indicating an active device, and routing information is configured to include a route to the active device's IP address via a secondary IP address, allowing for efficient traffic redirection without disrupting the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant network devices share the same IP address to improve availability, then network reliability is improved, but routing management complexity increases due to difficulty in determining active device and managing traffic flow
Solution Approach 1:
The patent introduces a switch as an intermediary device between the redundant network devices and the rest of the network. The switch maintains routing information that maps the shared IP address to the current active device's MAC address, effectively mediating the complexity of tracking active device status. This intermediary approach allows redundant devices to share IP addresses while keeping routing management simple and centralized at the switch level.
2Loss of time
If routing information is updated dynamically to switch traffic between redundant devices, then traffic disruption time is reduced, but the complexity of real-time routing updates increases
Solution Approach 1:
The patent implements a feedback mechanism where the switch receives notifications from redundant network devices about their active/inactive status. When a device becomes inactive or active, it sends a notification to the switch, which then updates its routing information accordingly. This feedback loop enables automatic, real-time routing updates without requiring complex manual intervention or sophisticated protocols, reducing both traffic disruption time and update complexity.
3Ease of operation
If direct connection between switch and redundant devices is implemented to simplify topology, then device connectivity is improved, but the challenge of managing IP address conflicts and active device identification increases
Solution Approach 1:
The patent uses MAC address changes as an identifier to detect which redundant device is active. When a redundant network device becomes active or inactive, its MAC address visibility changes on the switch port, providing a clear signal for the switch to update its routing information. This approach simplifies active device identification in a direct connection topology without requiring complex identification protocols.
Data Source
AI summary
Embodiments of a device and method are disclosed. In an embodiment, a method for network management involves at a switch connected to redundant network devices, receiving a notification indicating that a first network device of the redundant network devices is active, where the redundant network devices share a first internet protocol (IP) address, and at the switch, configuring routing information to include a route to the first IP address via a second IP address of the first network device.