Multi-chassis Switch Modular Center Stage Design
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Solution Overview
Problem
Traditional network switches face challenges in scalability and reliability due to physical constraints and the need for frequent upgrades or replacements of center stage crossbars, which can lead to network downtime and increased costs.
Innovation Solution
Implementing a multi-chassis network switch with independent modular center stage devices that can be distributed across multiple equipment racks or locations, allowing for flexible configuration and redundancy, thus enabling scalable and resilient network operations without a single point of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional network switches use a single chassis with center stage crossbars, then the switch fabric can be compact and integrated, but the system lacks scalability and reliability due to physical constraints and single points of failure
Solution Approach 1:
The patent divides the traditional single-chassis switch into multiple independent chassis units. Each chassis contains its own crossbar components (ingress, egress, or center stage), and these chassis are interconnected via data links and control links. This segmentation eliminates single points of failure, as each chassis can operate independently, thereby improving network reliability while distributing system complexity across multiple manageable units.
Solution Approach 2:
The patent transitions from a two-dimensional single-chassis architecture to a three-dimensional multi-chassis distributed architecture. By adding the spatial dimension of multiple chassis connected via inter-chassis links, the system achieves both improved reliability through redundancy and manageable complexity through modular deployment across different physical locations.
2Productivity
If the switch fabric is expanded to increase bandwidth and port capacity, then the network capacity improves, but the physical constraints of a single chassis limit further scalability
Solution Approach 1:
The patent segments the switch fabric functionality across multiple chassis, allowing each chassis to be optimized for specific functions (ingress, egress, or center stage). This enables linear scalability by simply adding more chassis units to the distributed fabric, overcoming the physical space limitations of a single chassis while maintaining high network capacity.
Solution Approach 2:
The patent creates a nested hierarchical structure where multiple chassis are logically nested within a unified distributed switch fabric. Each chassis contains crossbar components that are part of the larger fabric, allowing the system to scale by nesting additional chassis units without being constrained by the physical boundaries of any single chassis.
3Productivity
If center stage crossbars are upgraded or replaced to improve performance, then the switch fabric capability increases, but network downtime occurs during maintenance
Solution Approach 1:
The patent segments the center stage functionality into multiple independent crossbar components distributed across different chassis. This allows individual crossbars to be upgraded, replaced, or maintained without affecting the operation of other crossbars in the distributed fabric, enabling zero-downtime maintenance and continuous network operation during upgrades.
Solution Approach 2:
The patent implements redundancy by distributing center stage crossbars across multiple chassis, creating a cushion against maintenance activities. When one crossbar requires maintenance, the system is already cushioned by the presence of other operational crossbars that can handle the traffic load, allowing seamless upgrades without network downtime.
4Reliability
If multiple independent controllers are used to control different crossbar components, then the system achieves better fault isolation and reliability, but the control architecture becomes more complex
Solution Approach 1:
The patent segments the control architecture by assigning independent controllers to specific crossbar components (ingress, egress, center stage). Each controller manages its associated crossbar independently, providing fault isolation where a controller failure only affects its local crossbar. The controllers are interconnected via control links that enable coordinated operation, balancing reliability through segmentation with manageable complexity through standardized inter-controller communication.
Data Source
AI summary
A system may comprise a first group of switches, each switch including a first group of inputs and outputs, and a first group of controllers, each controller being independent from one another and corresponding to a switch of the first group of switches, to selectively control the switch to connect the switch's inputs with outputs. The first group of switches and controllers may be installed in a chassis. The system may comprise a second group of switches, each switch including a second group of inputs and outputs, and a second group of controllers, each controller corresponding to a switch of the second group of switches, to selectively control the switch to connect the switch's inputs with outputs. The second group of controllers may control and connect, via a group of control links, to the first group of controllers.