Introduction
Over time, new features, bug fixes, and security updates are added to the operating system, and it becomes necessary to upgrade the software. The WLC has to reload, and all connected wireless access points (APs) will temporarily go offline because they rely on the WLC for control and management. During this downtime, the APs cannot provide wireless service to clients. Once the WLC comes back online, the APs will reconnect to the WLC and may need to load the new software image from the controller. This process involves the APs rebooting and updating their firmware, which adds to the overall downtime until the entire network is back up and running on the new software version.
A Cisco C9800-40-K9 WLAN Controller has been used for this guide. This model is designed for mid-sized enterprises, and supports up to 2000 access points & 32,000 clients.
Compatibility Matrix
Checking the compatibility matrix before upgrading the software on a WLC is crucial because it ensures that the new software version is supported by your specific hardware model and access points. This prevents potential system instability, feature loss, and network outages that can occur if incompatible software is installed. It also helps maintain security, performance, and regulatory compliance, and ensures that the network elements work seamlessly together. Moreover, using a compatible software version ensures that you remain within warranty and support agreements, which is essential for obtaining technical assistance if needed. The WLC runs the version 17.9.4a and will prform a software upgrade to version 17.9.5. The WLC compatibility matrix shows that the following devices will be compatible with the new software:
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