Redundancy Node Packet Ring Network Failure Recovery
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Solution Overview
Problem
The existing Resilient Packet Ring (RPR) network systems face challenges in maintaining connectivity with client apparatuses during node or link failures, leading to reduced communication quality, increased CPU and memory resource consumption, and reduced ring bandwidth due to inefficient packet routing and lack of redundant configurations.
Innovation Solution
A packet ring network system with redundancy nodes, each having two nodes with the same address, duplicating packets and distributing them to both nodes, and employing failure detection and output selection mechanisms to ensure seamless packet transfer and minimize redundant transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single node is used in the RPR network, then the device complexity is reduced, but the reliability deteriorates when node or link failures occur
Solution Approach 1:
The system segments the network into active nodes and standby nodes within redundancy groups. Each redundancy node is divided into functional segments (active/standby) that can be independently managed and switched, allowing failure isolation without collapsing the entire network
Solution Approach 2:
Standby nodes are pre-configured with the same address and packet transfer capabilities before failures occur. When a failure is detected, the pre-prepared standby node can immediately take over without requiring reconfiguration or address changes, enabling seamless failover
2Reliability
If packets are transmitted to both active and standby nodes, then the reliability is improved through redundancy, but the loss of substance increases due to redundant packet transmission
Solution Approach 1:
The system dynamically adjusts packet routing based on the operational state of nodes. During normal operation, packets are routed only to active nodes. Upon failure detection, the routing dynamically switches to standby nodes, optimizing bandwidth utilization while maintaining reliability
Solution Approach 2:
Instead of continuously duplicating packets to both active and standby nodes, the system creates packet copies only when necessary - specifically when switching from active to standby nodes during failure scenarios, eliminating unnecessary bandwidth consumption
3Reliability
If failure detection and switching mechanisms are implemented, then the reliability is improved, but the device complexity increases due to additional control functions
Solution Approach 1:
Failure detection and switching functions are merged into the existing packet transfer infrastructure. The same communication channels and node addresses are used for both normal packet transfer and failure detection, eliminating the need for separate monitoring systems and reducing overall complexity
Solution Approach 2:
The network nodes perform self-detection of failures through monitoring packet transfers and peer node status. Each node autonomously determines when switching is needed and executes the transition without requiring centralized control or external management systems
Data Source
AI summary
In a ring network to which a plurality of nodes are connected, even though a failure occurs in a link between a node and a client apparatus (a user terminal) or a node itself, communication between the node and the client apparatus can be achieved. Nodes (105a) and (105b) are provided, so that, even though a failure occurs at either one of the nodes in the link between the node and the client apparatus (102), communication can be done between the other node and the client apparatus (102) through the link. When the node (105a) has a failure, the node (105b) succeeds in operation of the node (105a) while the node (105a) holds a state of the node (105a) to avoid a steering operation or a lap protection operation, a packet disappearance in the packet ring caused by the operation, influence of traffics a packet route change, etc., consumption of CPU and memory resources, and a ring transfer band reduction.