Release Notes for Cisco Catalyst 9800 Series Wireless Controller, Cisco IOS XE Dublin 17.11.x

Product Overview

The Cisco Catalyst 9800 Series Wireless Controllers are next-generation controllers built for intent-based networking. They integrate radio frequency (RF) capabilities from Cisco Aironet with the intent-based networking features of Cisco IOS XE. These controllers are designed for enterprise-grade performance, offering high availability (HA), seamless software updates, and built-in security features such as secure boot, run-time defenses, and image signing.

Deployment Options

The controllers are available in multiple form factors to suit various deployment needs:

• Appliance: Dedicated hardware for on-premise deployments.
• Cloud: Virtual form factor for private or public cloud environments.
• Embedded: Integrated into Cisco Catalyst switches for Software Defined-Access (SDA) deployments.

Key Features in 17.11.1

This release introduces several enhancements, including:

• 6-GHz Radio Support: Expanded support for Albania, Iceland, Lichtenstein, Norway, and Switzerland.
• Background Scanning: Improved Mesh Access Point (MAP) neighbor discovery and parent switching.
• Client Debug Bundle: Simplified troubleshooting by collating logs and packet captures into a single tar file.
• Out-of-Band AP Image Download: Enhanced methods for faster and more flexible AP upgrades.
• Product Analytics: Collection of non-personal usage data to drive continuous product improvements.

Security and Maintenance

Cisco strongly recommends using strong cryptographic algorithms. Weak algorithms like RSA keys under 2048 bits, MD5, DES, and 3DES are being phased out. Users are advised to migrate to stronger alternatives to maintain management access. The system includes built-in security mechanisms, and administrators should follow best practices for password encryption and trustpoint management.

Upgrade and Compatibility

Before upgrading, ensure you review the specific upgrade path for your current software version. The controllers support a wide range of Cisco Access Points and hardware modules. Always verify compatibility with the Cisco Wireless Solutions Software Compatibility Matrix before proceeding. During upgrades, ensure route processor ports are not flapped to avoid potential kernel crashes.

Troubleshooting

For troubleshooting, utilize the Cisco Bug Search Tool to identify known issues. The release notes provide detailed information on open and resolved caveats. If you encounter issues, refer to the official Cisco documentation for log collection and debugging procedures.