Smart Local Device Rediscovery via Unicast Multicast Discovery
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Solution Overview
Problem
Existing network device discovery methods are inefficient, causing delays in accessing and displaying status information of network devices, especially when devices change addresses or become unavailable, which is undesirable for timely user interaction and remote access.
Innovation Solution
Implementing smart local rediscovery by transmitting unicast status update requests to the last known address of network devices and concurrently sending multicast discovery requests, allowing for quick access to persistent devices and updating the cache with new addresses and statuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If only multicast discovery requests are used to find network devices, then all devices including new ones can be discovered, but significant delays occur before status information is displayed
Solution Approach 1:
The system performs preliminary actions by sending unicast requests to the last known address of each device before relying on multicast discovery. This allows the system to proactively check if devices are still accessible at their previously known addresses, significantly reducing the time to retrieve status information for persistent devices.
Solution Approach 2:
The system implements feedback by comparing the responses from unicast requests with the cached address information. When a unicast request succeeds, it confirms the device is still at its last known address. When it fails, the system uses multicast discovery to find updated addresses and updates the cache accordingly, creating a continuous feedback loop that maintains address accuracy.
2Speed
If unicast requests are sent to last known addresses, then quick access to persistent devices is achieved, but devices that have changed addresses may not be found
Solution Approach 1:
The system merges two discovery approaches by simultaneously sending both unicast requests to last known addresses and multicast discovery requests to the network. This combination allows the system to benefit from the speed of unicast for persistent devices while maintaining the comprehensive coverage of multicast for detecting address changes and discovering new devices.
Solution Approach 2:
The system dynamically adapts its discovery strategy by evaluating responses from both unicast and multicast requests. Based on whether devices respond at their last known addresses or are found through multicast, the system updates its cache and adjusts future discovery behavior, making the discovery process flexible and adaptive to changing network conditions.
3Reliability
If multicast discovery requests are transmitted, then new devices and address changes are detected, but the process is slow and inefficient for frequently accessed devices
Solution Approach 1:
The system segments the device discovery process into two distinct phases: a quick check phase using unicast requests to last known addresses for efficient status retrieval, and a comprehensive discovery phase using multicast requests to detect new devices and address changes. This segmentation allows each method to be used optimally for its strength while minimizing overall time and resource consumption.
Solution Approach 2:
The system performs partial discovery actions by sending unicast requests to specifically targeted last known addresses rather than performing a complete multicast discovery for every status check. This partial action is sufficient for frequently accessed devices while consuming fewer network resources and time, with full multicast discovery reserved for detecting changes when needed.
Data Source
AI summary
A smart local device rediscovery method is disclosed to take advantage of network devices with persistent addresses. A network device can quickly display cached status information from known network devices to a user while transmitting status update and network discovery requests to determine the accuracy of the cached information. The network device can use cached last known addresses to send unicast status update requests to known devices while concurrently performing a multicast discovery request to check for new devices or devices with changed addresses. A user can be provided with cached information immediately and the display can be updated as replies to the status update requests and discovery requests are received.