WDM Tenant Isolation in Multi-Tenant Cloud Systems
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Solution Overview
Problem
Multi-tenant cloud systems face challenges in isolating tenants due to frequent reconfigurations, which can lead to hardware errors and misconfigurations, resulting in data leakage, performance disruptions, and increased security risks from unintentional domain connections.
Innovation Solution
The implementation of physical layer network isolation using coarse wavelength division multiplexing (CWDM) or wavelength division multiplexing (WDM) with color-coded optical transceiver modules to segregate domains and prevent inter-domain communication, ensuring visually-verifiable domain isolation and minimizing misconfiguration errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shared computational resources are used in multi-tenant cloud systems, then resource efficiency and cost-effectiveness are improved, but isolation between tenants deteriorates due to frequent reconfigurations and hardware errors
Solution Approach 1:
The patent applies physical layer segmentation by dividing the network into separate optical domains using wavelength division multiplexing. Each tenant is assigned specific wavelengths (e.g., 1310nm, 1550nm) that are physically isolated from other tenants' wavelengths at the optical fiber level, preventing any form of data leakage or interference between tenants while sharing the same physical infrastructure.
Solution Approach 2:
The patent introduces optical transceivers and wavelength-selective switches as intermediary devices that enforce isolation between tenants. These intermediaries at the optical layer ensure that signals from one tenant's domain cannot accidentally connect to another tenant's domain, even during reconfigurations, thereby maintaining isolation reliability while enabling resource sharing.
2Adaptability or versatility
If frequent reconfigurations are performed to support dynamic client needs, then system adaptability is improved, but the risk of misconfigurations and domain connections increases
Solution Approach 1:
The patent replaces traditional electrical/network layer configuration mechanisms with optical layer mechanisms. By using wavelength division multiplexing at the optical level, the system achieves configuration changes without electrical signal interference. Optical domains are established through physical wavelength assignment rather than software configuration, eliminating the risk of electrical cabling errors during reconfigurations.
Solution Approach 2:
The patent uses wavelength (color) differentiation to identify and isolate tenant domains. Each tenant is assigned specific optical wavelengths that are visually and physically distinguishable, allowing the system to maintain clear domain separation even during dynamic reconfigurations. The wavelength assignment acts as an intrinsic identifier that prevents misconfiguration by design.
3Reliability
If physical network isolation is implemented using wavelength division multiplexing, then domain isolation and security are improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent makes existing optical network infrastructure universal by enabling it to provide both standard network functions and physical layer isolation simultaneously. The same optical switches and transceivers used for normal network operation also enforce wavelength-based domain isolation, eliminating the need for separate isolation hardware and reducing overall system complexity.
Solution Approach 2:
The patent changes the isolation parameter from traditional network layer (software-based VLANs, firewalls) to the physical/optical layer (wavelength assignment). This parameter change fundamentally simplifies isolation enforcement because optical wavelengths are physically distinguishable and cannot be accidentally mixed, providing stronger isolation with less complex management compared to software-based approaches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the incidence of incorrect physical network configurations, maintains domain isolation, and enhances security by ensuring that only compatible interfaces communicate, thereby preventing data breaches and performance disruptions.
Implementation Method 1
The implementation of physical layer network isolation using coarse wavelength division multiplexing (CWDM) or wavelength division multiplexing (WDM) with color-coded optical transceiver modules to segregate domains
Data Source
AI summary
Isolating tenants in a multi-tenant cloud system includes identifying a plurality of tenants in the multi-tenant cloud system, assigning a domain to each tenant of the plurality of tenants based on a wavelength division multiplexing (WDM), for each wavelength set of the plurality of wavelength sets, associating each wavelength set with a different domain of the plurality of domains and with a different indicator identifying the domain for the wavelength set, and isolating each tenant using the associated wavelength sets and associated indicators. The plurality of tenants share computational resources in the multi-tenant cloud system and the domain includes the computational resources for each tenant. The WDM uses a plurality of wavelength sets and each wavelength set includes one or more wavelengths.