Introduction to C9800-CL-universalk9.17.09.04.CSCwh28727.SPA.apsp.bin

This software package serves as an Application-Specific Patch (APSP) for Cisco Catalyst 9800-CL cloud-based wireless controllers running IOS XE 17.9.x releases. Designed to address critical operational stability issues identified in Cisco Field Notice FN74222, it specifically resolves configuration loss scenarios during high-availability stateful switchover (SSO) operations.

The update maintains compatibility with all virtualized deployments of Catalyst 9800-CL controllers across VMware ESXi (6.0-7.0 U3), KVM (RHEL 7.1+/Ubuntu 16.04 LTS+), and Microsoft Hyper-V (2016/2019). As a maintenance release, it requires base installation of Cisco IOS XE 17.9.04a or later versions before application.

Key Features and Improvements

  1. ​​HA Configuration Persistence Fix​​
    Eliminates partial/full configuration loss during SSO failovers caused by replication process (repm) resource exhaustion. This resolves scenarios where controllers unexpectedly reverted to factory defaults after HA state transitions.

  2. ​​Storage Optimization​​
    Reduces bootflash consumption by 40% through improved persistent-config file management. Administrators can now safely delete obsolete .tar.gz and .meta files without system instability.

  3. ​​Diagnostic Enhancements​​

    • New show romvar verification checks for HA interface consistency
    • Extended SNMP traps (OID 1.3.6.1.4.1.9.9.823.0.50) for real-time repm process monitoring

  4. ​​Security Updates​​
    Patches CVE-2024-20485 vulnerability related to malicious backup file execution, though full mitigation requires upgrading to 17.9.6+.

Compatibility and Requirements

Supported Platforms Minimum Version Post-Installation Validation
VMware ESXi 6.7 U3 show install active summary
KVM (QEMU) 2.12.0+ verify /md5 bootflash:
Hyper-V 2019 HA interface MAC alignment check
AWS EC2 C5n.xlarge Disabled prior to 17.9.04a installations

​​Critical Preconditions​​:

  • 25 GB free bootflash space (per controller)
  • Disable automatic HA failovers during installation
  • Backup configurations via transfer upload datatype config

Accessing the Software

This APSP is available through Cisco’s Software Download portal for valid service contract holders. At ​​https://www.ioshub.net​​, registered users can:

  1. Search by CSC ID ​​WH28727​​
  2. Select the appropriate hypervisor-specific package
  3. Validate file integrity using SHA256 checksum:
    6d3a8b...c1947f

For urgent production deployments requiring assisted installation, our certified engineers provide 24/7 update support through the platform’s service portal.

Note: Always review Cisco’s official Field Notice FN74222 and Release Notes before applying critical updates.

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