Multiplane Switch Control for Symmetric HPC Network Routing
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Solution Overview
Problem
Existing network switches in high-performance computing (HPC) networks face challenges in achieving high bandwidth and low latency while maintaining symmetry and consistency across multiple planes, particularly in managing multiplane networks where switches are divided into smaller bandwidth components.
Innovation Solution
A centralized software-defined network (SDN) controller manages multiple smaller bandwidth switch ICs as a single logical entity, enforcing symmetry and consistency by using shared identifiers and transmission parameters across planes, and dynamically adjusting plane activation to maintain connectivity and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network switches are divided into smaller bandwidth components (multiplane architecture), then device complexity is reduced and reliability is improved, but bandwidth aggregation and symmetry maintenance become more difficult
Solution Approach 1:
The patent merges multiple independent switch planes into a single logical entity through an SDN controller. The controller aggregates routing tables, identifiers (GIDs, LIDs), and transmission parameters across all planes, presenting a unified management interface while maintaining individual plane operation. This resolves the contradiction by combining management functions (reducing complexity) while preserving plane independence (maintaining reliability).
Solution Approach 2:
The SDN controller acts as an intermediary between the multiplane network infrastructure and endpoint devices. It mediates routing decisions, enforces symmetry across planes, and manages identifier allocation. This intermediary layer abstracts the complexity of managing multiple planes while ensuring reliable operation through centralized coordination.
2Productivity
If switches are managed as individual entities, then device complexity is lower, but network performance (bandwidth and latency) deteriorates due to lack of coordination
Solution Approach 1:
The patent combines multiple switch planes into a single logical entity managed by the SDN controller. Routing tables, identifiers, and transmission parameters are aggregated and coordinated across planes, enabling optimized path selection and load balancing. This merging approach improves network performance through coordinated resource utilization while the controller abstracts management complexity.
3Reliability
If symmetry is enforced across all planes, then network reliability improves through failure reflection, but adaptability to asymmetric failures decreases
Solution Approach 1:
The patent implements dynamic symmetry enforcement where the SDN controller continuously monitors plane status and adjusts routing decisions in real-time. When failures are detected, the controller dynamically reflects failures across planes to maintain symmetry for active paths while adapting routing to accommodate asymmetric failure conditions. This dynamic approach maintains reliability through failure reflection while preserving adaptability to actual network conditions.
Data Source
AI summary
A system for implementing a multiplane network comprises a network device including a plurality of switches for routing traffic to an endpoint through a network of other switches. Each switch in the plurality of switches corresponds to a different plane of the multiplane network. The system includes one or more circuits that manages the plurality of switches as a single logical entity.