This is a very old, End-of-Life (EOL) release.
If you intend to use this file, you must be aware of the "Field Upgrade" requirement.
Cisco 5500 Controllers usually ship from the factory with an older software version (often 7.x or early 8.x). Because of the way the partition tables are structured on the controller's flash memory, you cannot jump straight from an old version (like 7.6) to 8.3 directly.
No software is perfect. While stable, this version has specific quirks documented in Cisco Bug IDs:
If you want: a) exact release notes for version 8.3.150.0, b) upgrade commands, or c) AP compatibility matrix for a specific AP model, tell me which one and I’ll provide the detailed steps.
(Invoking suggested related search terms.)
The identifier AIR-CT5500-K9-8-3-150-0 a specific firmware image file for the Cisco 5500 Series Wireless Controller (WLC) . This specific version belongs to the 8.3 release train air-ct5500-k9-8-3-150-0
, which is a "Maintenance Release" (MR) path for Cisco wireless deployments. Key Technical Details Hardware Platform: Cisco 5508 Wireless Controller (AIR-CT5508-K9). Software Version: 8.3.150.0 (often referred to as 8.3 MR5). File Extension: Typically found as AIR-CT5500-K9-8-3-150-0.aes Release Date: This specific build (MR5) was generally released around early 2019 according to Cisco Release Notes Critical Upgrade Information
If you are planning to install or upgrade to this version, keep the following in mind: End-of-Life Notice: The 5508 WLC has reached its End-of-Software Maintenance milestone. Most 8.3.x releases are now considered legacy. Reboot Requirements: After downloading this image to the controller, a manual reboot is mandatory for the new software to take effect. Upgrade Path:
Ensure your current version is compatible with a direct upgrade to 8.3.150.0. Older versions (e.g., pre-7.0) often require an intermediate "hop" version. FIPS/CC Mode:
If your environment requires FIPS or Common Criteria compliance, verify the specific security certifications for build 150.0 on the Cisco Trust Portal Related Files AP Bundle: Often paired with AIR-CT5500-AP_BUNDLE-K9-8-3-150-0.aes
, which contains the lightweight access point images managed by the controller. Field Upgrade Software (FUS): Ensure your controller's Field Upgrade Software (FUS)
is at the required minimum version (usually 1.9.0.0 or higher for 8.x code) to avoid bootup issues. release notes for the specific bug fixes included in this 150.0 build? This is a very old, End-of-Life (EOL) release
: The hardware platform designation for the Cisco 5500 series controllers (most commonly the 5508 model). 8-3-150-0: The software release version (8.3.150.0). Technical Context & Capabilities
The 5500 series, specifically when running software version 8.3, was a mainstay for large-scale campus networks.
The AIR-CT5500-K9 (Cisco 5508 Wireless Controller) is a legacy enterprise-grade platform designed to manage large-scale wireless networks. Running software version 8.3.150.0 marks the "end of the road" for this specific software line, as it was the final maintenance release for the 8.3 train. Software Version 8.3.150.0 Overview
This release was primarily a stability-focused update, providing critical bug fixes and finalizing features introduced in the 8.3 cycle.
Key Features in 8.3 Train: Introduced Apple-Cisco fast lane for iOS device prioritization, Adaptive 802.11r for seamless roaming, and support for Wave 2 Access Points like the Cisco Aironet 2800 and 3800 series.
Lifecycle Status: Software maintenance for the 8.3 release officially ended on November 15, 2019. No software is perfect
Upgrade Path: For users requiring ongoing support, Cisco recommends migrating to the Release 8.5.x or 8.10.x software trains, which are the final supported paths for this hardware. Hardware Capabilities (5508 WLC)
Despite its age, the 5508 is remembered for its reliability in "mission-critical" environments.
Scalability: Supports up to 500 access points and 7,000 clients.
Performance: Designed for 802.11n environments with sub-second stateful failover (SSO) for high availability.
Form Factor: A standard 1RU rack-mount unit weighing approximately 20 lbs with redundant power supplies. Critical Lifecycle Milestones
The Cisco 5508 has officially transitioned into its sunset phase: Cisco 5500 Series Wireless Controllers Data Sheet