Logical Switch Fabric Overlays for Data Center Traffic Isolation
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Solution Overview
Problem
Conventional IP switch fabrics lack correlation between virtualized infrastructure overlays and physical forwarding infrastructure, leading to inefficient resource utilization and poor performance for time-sensitive applications like AI/ML.
Innovation Solution
The implementation of logical switch fabrics overlaid on a physical switch fabric, where network devices determine the overlay network and associate it with a logical identifier, allowing for deterministic forwarding across the physical fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple overlay networks are multiplexed over a single physical switch fabric, then resource utilization is improved, but traffic isolation and performance guarantees deteriorate
Solution Approach 1:
The patent segments the physical switch fabric into multiple logical switch fabrics by introducing logical identifiers (LIDs) that partition traffic flows. Each overlay network is assigned one or more LIDs, and switches use these LIDs to create separate forwarding tables and resource pools, enabling isolation while sharing the physical infrastructure.
Solution Approach 2:
The patent implements a nested structure where multiple logical switch fabrics are overlaid on top of a single physical switch fabric. The physical fabric acts as the container, while multiple logical fabrics with different identifiers are nested within it, allowing simultaneous operation of multiple tenant networks with guaranteed isolation.
2Speed
If deterministic forwarding is implemented for time-sensitive applications, then performance is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic resource allocation where the switch fabric can dynamically assign different physical resources (paths, bandwidth, switching capacity) to different logical identifiers based on traffic demands and QoS requirements. This enables deterministic forwarding performance while maintaining flexibility.
Solution Approach 2:
The patent changes the forwarding parameters by introducing logical identifiers that modify how packets are routed and prioritized. Switches use these LIDs to adjust forwarding decisions, resource allocation, and QoS parameters, enabling deterministic performance for time-sensitive traffic without requiring complete redesign of the physical fabric.
3Adaptability or versatility
If multiple logical switch fabrics are overlaid on physical fabric, then traffic engineering capability is improved, but management overhead increases
Solution Approach 1:
The patent introduces logical identifiers as intermediary elements that mediate between the physical switch fabric and the overlay networks. These LIDs simplify management by providing a standardized interface for traffic engineering, allowing administrators to manage multiple tenant networks through a unified system rather than managing each physical path individually.
Data Source
AI summary
Techniques are disclosed for overlaying logical switch fabrics upon a physical switch fabric comprising multiple physical switch devices. In one example, a network device determines an overlay network associated with a received packet. The network device determines a logical identifier that is associated with the overlay network. In some examples, the logical identifier corresponds to a color. The network device selects a logical switch fabric that is associated with the logical identifier from a plurality of other logical switch fabrics that are overlaid upon a physical switch fabric comprising a plurality of network switch devices. The network device forwards the received packet to the selected logical switch fabric for transport across the physical switch fabric.