Cascaded Aggregation Nodes for Packet Switching
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Solution Overview
Problem
Current packet switching networks face challenges in efficiently managing cascaded aggregation nodes to maintain high-speed and capacity communications, particularly in responding to faults and optimizing link usage, which can lead to increased costs and packet overhead.
Innovation Solution
A packet switching device comprising a host device and cascaded aggregation nodes that automatically form a single logical topology, allowing for fault-tolerant communication routing and efficient link management, where nodes can switch directions and disable non-adjacent links to maintain communication sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional packet switching networks use multiple independently managed aggregation nodes, then device capacity and bandwidth can be increased, but packet overhead increases and link usage efficiency decreases
Solution Approach 1:
The patent combines multiple aggregation nodes into a single logical device with a unified control plane, allowing centralized management of forwarding tables and link state information. This merging eliminates redundant packet overhead by ensuring that control packets are processed efficiently and that link state changes are propagated optimally across all physical nodes, thus maintaining high device capacity while reducing overall packet overhead in the network.
2Device complexity
If aggregation nodes are managed independently, then device complexity is reduced for individual nodes, but overall system reliability decreases due to fault propagation issues
Solution Approach 1:
The patent segments the control plane and data plane functions across the aggregation nodes. Each physical node maintains independent data forwarding capabilities (keeping individual node complexity manageable), while a distributed control plane mechanism ensures unified management and coordinated fault response. This segmentation allows each node to remain relatively simple while the system as a whole achieves high reliability through coordinated fault detection and recovery across all nodes.
3Quantity of substance
If cascaded aggregation nodes are used to expand network capacity, then bandwidth increases, but link usage optimization becomes more difficult leading to increased costs
Solution Approach 1:
The patent implements a universal control plane that manages multiple physical links and aggregation nodes through a single logical interface. This universal management system can dynamically allocate and optimize traffic across all cascaded links based on current network conditions, ensuring efficient utilization of bandwidth while simplifying link management. The unified control mechanism provides multi-functional capabilities including link state monitoring, dynamic routing optimization, and cost-effective resource allocation across the entire cascaded structure.
Data Source
AI summary
In one embodiment, a packet switching device includes one or more host devices and a cascade of aggregation nodes. The aggregation nodes aggregate customer traffic and communicate it with the host device. Typically the aggregation nodes are remotely located from the host device. The host device may be connected to one or both ends of the cascaded topology of aggregation nodes. In one embodiment, the cascaded topology of aggregation nodes automatically configures itself using initiation packets. In one embodiment, the cascaded topology of aggregation nodes reacts to detected faults, such as by changing direction packet traffic is sent through the cascaded topology. By cascading aggregation nodes, in contrast to having each aggregation node connected to the host device via one or more point-to-point links, communications costs are decreased in one embodiment.