Air-ct5500-k9-8-3-150-0 ❲2K❳

was designed to support medium-to-large-scale enterprise wireless deployments.

Capacity: It supports up to 500 Access Points (APs) and 7,000 clients simultaneously.

Performance: Offers 8 Gbps of throughput, which was industry-leading during its peak. air-ct5500-k9-8-3-150-0

Reliability: Known for high availability and "stateful switchover," ensuring that if one controller fails, another takes over without dropping client connections. Software Version 8.3.150.0 (Maintenance Release)

Released around 2019, this version is part of the 8.3 branch, which Cisco designated as a "Long Lived Release." This means it was prioritized for stability and security rather than just new experimental features. Critical Upgrade Precautions

If you are managing or upgrading a unit with this software, note the following important Cisco Release Guidelines:

Web-Auth Port 443 Conflict: Before upgrading to this release, Cisco recommends removing the config network web-auth port 443 configuration if it exists. Failure to do so can lead to access issues. Use the command config network web-auth port 0 to reset it. Field Notice 70440: Many 5508 controllers Go to product viewer dialog for this item.

manufactured before 2021 have an expiring certificate issue that may prevent new APs from joining. Version 8.3.150.0 and subsequent patches often address these certificate validation bugs. Legacy Status and the Shift to 9800 Series

is legendary for its durability, it has reached End of Life (EoL).

Support Status: Official software maintenance and security updates from Cisco have largely concluded for the 5508 series.

Modern Successor: Organizations have migrated to the Cisco Catalyst 9800 Series Wireless Controllers, which run IOS-XE and support newer standards like Wi-Fi 6 (802.11ax). Quick Command Reference for Admins If you are troubleshooting an AIR-CT5500-K9

running 8.3.150.0, these are the most helpful "health check" commands: show sysinfo: Checks uptime and general system health.

show ap summary: Verifies how many Access Points are currently joined and operational.

show run-config startup-commands: Useful for identifying the web-auth port conflict mentioned above.

The image air-ct5500-k9-8-3-150-0.aes is a Cisco Wireless LAN Controller (WLC) software release version 8.3.150.0 for the 5500 Series Controller.

A useful piece of information:
This specific version (8.3.x) is a long-term stable "extended maintenance" release. However, be aware that 8.3.150.0 is an older build; Cisco recommends upgrading to the latest 8.3.x maintenance release (e.g., 8.3.152.0 or later) if staying on the 8.3 train, or moving to a newer recommended release like 8.5.182.0 or 8.10.x (depending on your APs and security requirements) due to bug fixes and security patches, including those for KRACK and FragAttacks vulnerabilities.

Key prerequisites before upgrading:

• Ensure your Access Points (APs) support this code (e.g., 802.11ac Wave 1/Wave 2 APs like 2700/3700 series, but newer APs like 9100 series may require 8.10+).
• Check the ROMMON (bootloader) on the 5500 controller is compatible (minimum recommended version for 8.3 is 8.1.3.0).
• Upgrade path: If coming from a very old version (pre-8.0), an intermediate upgrade may be required.

Quick command to check current version on your WLC:
show sysinfo The AIR-CT5500-K9 (Cisco 5508 Wireless Controller) is a

Would you like help with the upgrade procedure or feature support for this release?

3. Why you should NOT use this version (Security)

If you are running this today, you are exposed to high-severity vulnerabilities:

• CVE-2019-15275 (Critical): Unauthorized access to the CLI.
• CVE-2018-15326 (Critical): Denial of Service via packet of death.
• CVE-2017-12219 (High): Maglev protocol vulnerability.

No fixes were back-ported to 8.3.150.0 because the train is obsolete.

Upgrade/operational tips

1. Verify current running config and backup full config + AP and WLC images.
2. Confirm AP compatibility matrix for the target image.
3. Schedule maintenance window for AP reboots during WLC upgrade.
4. Use CLI to upload image via SCP/TFTP and set boot image; reboot to apply.
5. Monitor AP join and client connectivity; roll back if issues.

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.)

Cisco Air-CT5500-K9-8-3-150-0: A Comprehensive Overview of the Wireless Controller

The Cisco Air-CT5500-K9-8-3-150-0 is a wireless controller designed to provide a centralized management platform for Cisco wireless access points. This device is part of the Cisco 5500 Series Wireless Controllers, which are engineered to support large-scale wireless networks. In this article, we will delve into the features, specifications, and benefits of the Cisco Air-CT5500-K9-8-3-150-0, as well as its applications and use cases.

Product Description

The Cisco Air-CT5500-K9-8-3-150-0 is a specific model of wireless controller that comes with an 8-port gigabit Ethernet switch, supporting up to 150 access points. The product code "Air-CT5500-K9-8-3-150-0" can be broken down as follows:

• "Air-CT5500": This refers to the Cisco 5500 Series Wireless Controller.
• "K9": This indicates that the device is a hardware model with a specific set of features and capabilities.
• "8": This represents the number of gigabit Ethernet ports on the device.
• "3": This refers to the software feature set, which includes support for advanced wireless features such as 802.1x authentication and guest access.
• "150-0": This indicates that the device supports up to 150 access points.

Key Features and Specifications

The Cisco Air-CT5500-K9-8-3-150-0 wireless controller offers a range of features and specifications that make it an ideal solution for large-scale wireless networks. Some of its key features include:

• Centralized Management: The device provides a centralized management platform for Cisco wireless access points, allowing administrators to manage and configure wireless networks from a single location.
• Scalability: The Cisco Air-CT5500-K9-8-3-150-0 supports up to 150 access points, making it suitable for large-scale wireless deployments.
• Gigabit Ethernet Ports: The device comes with 8 gigabit Ethernet ports, providing high-speed connectivity for wired devices.
• Advanced Wireless Features: The device supports advanced wireless features such as 802.1x authentication, guest access, and wireless intrusion detection and prevention.
• Redundancy and High Availability: The device supports redundancy and high availability features, ensuring that wireless networks remain operational even in the event of a hardware failure.

Benefits of the Cisco Air-CT5500-K9-8-3-150-0

The Cisco Air-CT5500-K9-8-3-150-0 wireless controller offers a range of benefits to organizations looking to deploy large-scale wireless networks. Some of its key benefits include:

• Improved Network Management: The device provides a centralized management platform for wireless access points, making it easier to manage and configure wireless networks.
• Increased Scalability: The device supports up to 150 access points, making it suitable for large-scale wireless deployments.
• Enhanced Security: The device supports advanced wireless security features such as 802.1x authentication and wireless intrusion detection and prevention.
• Reduced Downtime: The device supports redundancy and high availability features, ensuring that wireless networks remain operational even in the event of a hardware failure.

Applications and Use Cases

The Cisco Air-CT5500-K9-8-3-150-0 wireless controller is suitable for a range of applications and use cases, including: Ensure your Access Points (APs) support this code (e

• Large-Scale Wireless Deployments: The device is ideal for large-scale wireless deployments, such as those found in universities, hospitals, and large enterprises.
• Wireless Network Consolidation: The device can be used to consolidate multiple wireless networks into a single, centralized management platform.
• Wireless Network Expansion: The device can be used to expand existing wireless networks, providing support for additional access points and wireless devices.

Conclusion

The Cisco Air-CT5500-K9-8-3-150-0 wireless controller is a powerful and feature-rich device that provides a centralized management platform for Cisco wireless access points. With its advanced wireless features, scalability, and redundancy and high availability capabilities, the device is ideal for large-scale wireless deployments. Whether you're looking to consolidate multiple wireless networks, expand an existing wireless network, or deploy a new wireless network, the Cisco Air-CT5500-K9-8-3-150-0 is a reliable and efficient solution.

Technical Specifications

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

• Model Number: Air-CT5500-K9-8-3-150-0
• Device Type: Wireless controller
• Ports: 8 gigabit Ethernet ports
• Access Points Supported: Up to 150
• Wireless Standards: 802.11a/b/g/n/ac
• Security Features: 802.1x authentication, guest access, wireless intrusion detection and prevention
• Redundancy and High Availability: Supported

Warranty and Support

The Cisco Air-CT5500-K9-8-3-150-0 wireless controller comes with a limited lifetime warranty and support from Cisco. The device is also supported by Cisco's extensive network of partners and resellers, providing customers with access to a wide range of services and support options.

Pricing and Availability

The pricing and availability of the Cisco Air-CT5500-K9-8-3-150-0 wireless controller vary depending on the region and country. Customers can contact Cisco or a local Cisco partner for more information on pricing and availability.

In conclusion, the Cisco Air-CT5500-K9-8-3-150-0 wireless controller is a powerful and feature-rich device that provides a centralized management platform for Cisco wireless access points. With its advanced wireless features, scalability, and redundancy and high availability capabilities, the device is ideal for large-scale wireless deployments.

This is intended for network engineers planning to upgrade or deploy a Cisco 5500 Series Wireless LAN Controller.

3. Upgrade Path

Best Practices for Deploying 8.3.150.0 Today

If you plan to run this image in production for the next 3-5 years, follow these rules:

1. Disable PMIPv6: Unless used explicitly, turn it off (config network pmipv6 disable) to free CPU.
2. Set AP Heartbeat to 30 seconds: Default is 10 seconds, leading to false flapping in congested networks. config ap timeout 30
3. Use FlexConnect Groups: For remote sites, segment your APs into groups of 25. Version 8.3 handles 100 APs per group poorly but 25 perfectly.
4. Schedule Reboots: Despite its stability, schedule a reset system every 180 days to clear memory fragmentation.

Issue: OfficeExtend (OEAP) fails to build VPN tunnel.

• Diagnosis: DTLS certificate versions. 8.3.150.0 disables SSLv3 by default.
• Solution: Run config network secureweb cipher-version tlsv1.2 to force modern ciphers.

Comparison: 8.3.150.0 vs. 8.5.182.0

If you are debating whether to stay on 8.3 or leap to 8.5, here is the reality check:

| Feature | AIR-CT5500-K9-8-3-150-0 | 8.5.182.0 (Later release) | | :--- | :--- | :--- | | AP Support | Up to 3800 (Wave 1 stable) | 4800, 9100 series (Wave 2) | | Memory Usage | ~512 MB (Stable) | ~1.2 GB (High) | | Web GUI Speed | Fast (Java-free HTML5) | Slow (Heavy AngularJS) | | Recommended for? | Legacy 5508, High uptime | Newer 5520, Feature testing |

Verdict: If you do not need 802.11ax (Wi-Fi 6) APs, stay on 8.3.150.0. It is the last version that treats the 5500 series with respect.

Pros

• Centralized Management: Offers a centralized view and management of the wireless network, making it easier to configure, monitor, and troubleshoot.
• Integration: Easily integrates with other Cisco networking and security solutions, providing a comprehensive and cohesive infrastructure.
• Reliability: Known for high reliability and performance, reducing the need for frequent upgrades or replacements.