Detecting Wireless AP Configuration Errors via Authentication Weight Tracking
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Solution Overview
Problem
Detecting and locating roaming/mobility configuration problems in wireless network devices is time-consuming and reactive, often resulting in overloading of authentication servers due to excessive re-authentication, requiring days or weeks of troubleshooting and involving end-user queries.
Innovation Solution
A management server communicates with an authentication server to receive event logs and adjusts weights for access points (APs) and wireless local area network (WLAN) controllers (WLCs) based on authentication requests, identifying improperly configured devices by tracking roaming conditions and triggering unnecessary re-authentications, thereby pinpointing configuration issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roaming/mobility is not properly configured on APs and WLCs, then endpoint devices perform re-authentication during roaming events, but this causes overloading of the authentication server and scalability problems
Solution Approach 1:
The system performs preliminary analysis of authentication requests to identify configuration issues before they cause server overload. By proactively detecting improperly configured APs and WLCs through weight tracking and pattern recognition, the system prevents excessive re-authentication events from occurring, thereby protecting authentication server capacity while ensuring reliable roaming functionality.
2Measurement precision
If traditional debugging methods are used to locate roaming configuration problems, then individual endpoint devices are queried, but this process is time-consuming and reactive, taking days or weeks
Solution Approach 1:
The system enables self-service troubleshooting by automatically analyzing authentication request patterns and identifying improperly configured network devices. The weight tracking mechanism and automated detection algorithms eliminate the need for manual debugging of individual endpoint devices, providing precise problem location information instantly rather than requiring days or weeks of reactive troubleshooting.
Solution Approach 2:
The system implements continuous feedback monitoring of authentication requests to detect configuration issues in real-time. By tracking weights associated with different APs and WLCs based on authentication patterns, the system provides ongoing feedback about system health and configuration problems, enabling immediate detection and resolution rather than delayed reactive troubleshooting.
3Adaptability or versatility
If endpoint devices roam between APs controlled by different WLCs, then authentication requests are generated, but excessive requests indicate improper roaming configuration
Solution Approach 1:
The system introduces an intermediary analysis layer between endpoint devices and authentication servers that monitors authentication request patterns. This intermediary tracks weights associated with different WLCs and APs, identifying configuration issues without requiring changes to endpoint devices or authentication server logic. The intermediary detects when roaming between different WLCs generates excessive authentication requests, indicating improper configuration, while preserving full roaming capability.
Data Source
AI summary
A management server communicates with an authentication server that authenticates endpoints, which are configured to connect wirelessly with access points (APs) controlled by respective ones of a plurality of controllers. Weights for the APs and the controllers are stored. Event logs detailing requests for authentication of the endpoints are received. For each request, roaming conditions for the endpoint that triggered the request are determined. Also, a respective weight of one or more of the AP connected with the endpoint and of the controller that controls the AP is increased by a respective amount depending on whether the roaming conditions are caused by the AP and the controller being improperly configured or properly configured. Identities of ones of the APs and the controllers having weights that exceed one or more weight thresholds each indicative of an improperly configured AP or controller are stored.