Hot-Plug Network Device Module Detection and Virtual Machine Integration
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Solution Overview
Problem
Current network devices require shutdown for adding or removing components, leading to unwanted downtime, and lack mechanisms for automatically recognizing new or removed components within a virtual machine environment, especially when using a virtual machine to run the network operating system.
Innovation Solution
The implementation of a network device with hardware and software components that enable hot-plugging of modules and cards, including a system module for detecting components, an emulated bridge module for virtual machine integration, and a hot-plug driver for managing component addition and removal within both the host and virtual machine operating systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device is powered off to add or remove components, then the component installation is simple and reliable, but the network device experiences unwanted downtime
Solution Approach 1:
The system performs preliminary actions by detecting the presence of a component before it is fully integrated into the virtual machine. The host operating system detects the physical component addition, determines its information, and adds it to the host OS beforehand. This preparation enables the virtual machine to subsequently recognize and integrate the component without requiring network device shutdown, thus maintaining reliability while eliminating downtime.
2Loss of time
If the network device supports hot-plugging, then the network device can operate continuously without downtime, but the system complexity increases due to hardware and software coordination requirements
Solution Approach 1:
The patent introduces an intermediary detection mechanism that mediates between the physical hot-plug event and the virtual machine's component integration. The host operating system acts as an intermediary layer that detects physical component additions, determines component information, and coordinates the addition process. This intermediary approach enables hot-plugging functionality while managing system complexity by centralizing the detection and coordination logic in the host OS rather than requiring complex modifications across multiple system layers.
Solution Approach 2:
The hot-plug process is segmented into distinct phases: (1) physical component detection by the host operating system, (2) component information determination, (3) component addition to the host OS, and (4) component integration into the virtual machine. This segmentation allows each phase to be handled independently with appropriate software components, reducing overall system complexity while enabling continuous operation during component changes.
3Productivity
If the virtual machine automatically recognizes new components, then the component integration is seamless and fast, but the software complexity within the virtual machine environment increases
Solution Approach 1:
The system implements feedback mechanisms where the host operating system monitors for physical component changes and automatically triggers the component addition process. When a component is physically added to the network device, the host OS detects this change, determines the component's information, and automatically adds it to both the host OS and the virtual machine. This feedback-driven automation enables seamless component integration without requiring complex virtual machine software, as the host OS handles the detection and coordination logic.
Data Source
AI summary
A network device may include various cards and modules, such as management modules, line cards, and switch fabric modules. In various implementations, these components can be “hot-plugged” meaning that the components can be inserted into and removed from the network device while the network device is powered on. In various implementations, hardware in the network device can identify when a component has been added. The hardware can notify a virtual machine, which can then notify the host operating system. The host operating system can added the component, and then notify the virtual machine to also add the component. Once the virtual machine has added the component, the component becomes available for use by processes executing on the virtual machine.