Wireless Controller Migration Delivers Zero-Downtime Infrastructure Modernization
A comprehensive wireless infrastructure modernization project migrated 109 access points from legacy Cisco 5508 to new 5520 controllers through eight controlled production cutover windows.
The Organization
A healthcare organization operating critical wireless infrastructure supporting patient care systems, medical devices, and staff mobility across multiple facilities with stringent uptime requirements.
The Challenge
The healthcare organization's wireless infrastructure relied on aging Cisco 5508 controllers that were approaching end-of-support. The migration to new 5520 controllers required careful planning to ensure zero disruption to critical healthcare operations.
The complexity of migrating 109 access points while maintaining continuous wireless connectivity for medical devices, patient monitoring systems, and staff communications demanded a sophisticated phased approach with comprehensive testing and rollback capabilities.
IVI's Approach
IVI implemented a lightweight Agile framework specifically designed for infrastructure migrations, incorporating comprehensive testing, phased rollouts, and real-time command center coordination during production cutovers.
Conducted technical requirements gathering, inventory validation, and developed comprehensive Low Level Design documentation covering HA-SSO architecture, management design, and AP migration methodology.
Built parallel test environment to validate AP join behavior, firmware upgrades, HA failover scenarios, and client connectivity patterns before production implementation.
Executed eight controlled production cutover windows, migrating approximately 13 APs per window with real-time coordination through IVI Command Center and immediate rollback capabilities.
Performed comprehensive Acceptance Test Plans including AP connectivity validation, client authentication testing, and HA failover verification with 16 hours of day-one support coverage.
Technology Stack Migrated
Migration Outcomes
The wireless infrastructure modernization was completed successfully with zero service disruption, delivering improved reliability and positioning the healthcare organization for future wireless technology adoption.
All 109 access points successfully migrated across eight production windows with no service interruption to critical healthcare operations or patient care systems.
New Cisco 5520 HA-SSO architecture provides improved redundancy and failover capabilities compared to legacy 5508 platform.
Comprehensive Acceptance Test Plans confirmed AP connectivity, client authentication, roaming performance, and HA failover functionality in production environment.
Modern controller platform supports advanced wireless features and provides foundation for future healthcare technology initiatives requiring robust wireless connectivity.
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