Air-ct5500-k9-8-3-150-0 (2025)

Despite its age, the 5508 is remembered for its reliability in "mission-critical" environments.

This release was significant because it bridged the gap between the older 8.2 architecture and the modern features required for high-density environments. Key capabilities unlocked by this software include:

Today, the AIR-CT5508 is largely considered a legacy device, having reached its End-of-Software-Maintenance milestone. For many organizations, version 8.3.150.0 was one of the final "safe harbors"—a stable version to remain on before migrating to the newer 3504, 5520, or 9800 series controllers. It represents the peak of the AireOS operating system before Cisco’s transition toward IOS-XE-based controllers. Conclusion

Ensure coverage hole detection is enabled to automatically boost AP power if a client suffers from sudden signal drops. High Availability (HA-SSO)

The product refers to a Cisco 5508 Wireless Controller Go to product viewer dialog for this item. air-ct5500-k9-8-3-150-0

: It is highly recommended that when upgrading to version 8.3.150.0, you also install the compatible Field Upgrade Software (FUS) image for your controller. The FUS is a special AES package that updates critical system-level components like the bootloader, field recovery image, and FPGA/MCU firmware. For this release, Cisco recommended using FUS version 1.9.0.0 or later to ensure full compatibility and stability.

The 5508 hardware contains eight Gigabit Ethernet SFP ports, a service port, a console port (RJ‑45 and mini‑USB), and two USB ports for maintenance. Link Aggregation (LAG) is supported and automatically enabled on some models.

Here are the technical specifications of the Cisco Air-CT5500-K9-8-3-150-0 wireless controller:

If you have a 5508 or WiSM2 controller currently on , you cannot jump to modern code in one step. Despite its age, the 5508 is remembered for

It supports a range of base licenses for 12, 25, 50, 100, 250, or 500 access points , which can be expanded as your network grows.

Do not purchase a 5500 Series controller today – the hardware is end‑of‑sale and will soon reach end‑of‑support. Instead, migrate to the Catalyst 9800 Series, which offers superior performance, modern security, and a longer support lifecycle.

The keyword refers to a specific firmware image file ( AIR-CT5500-K9-8-3-150-0.aes ) used to update or restore the Cisco 5508 Wireless LAN Controller (WLC) Go to product viewer dialog for this item.

(Cisco Controller) >transfer download datatype code (Cisco Controller) >transfer download mode tftp (Cisco Controller) >transfer download serverip 192.168.1.100 (Cisco Controller) >transfer download filename AIR-CT5500-K9-8-3-150-0.aes (Cisco Controller) >transfer download start For many organizations, version 8

A software release's security posture is a primary concern for any administrator. While 8.3.150.0 was considered stable, it is not immune to vulnerabilities, some of which are only discovered later.

Upgrading and Configuring the Cisco AIR-CT5500-K9 with Software Release 8.3.150.0

The keyword refers specifically to the Cisco 5508 Wireless LAN Controller (AIR-CT5508-K9) running software image 8.3.150.0 . This hardware and software combination is a staple in enterprise networking, designed to manage high-density wireless environments with up to 500 access points and 7,000 clients . Hardware Foundation: Cisco 5508 Series (AIR-CT5508-K9)