​​Introduction to ciscocm.dst-updater.2021c-el7-00.14.0.1.cop.sha512 Software​​

This Cisco Options Package (COP) provides critical timezone rule updates for Cisco Unified Communications Manager (CUCM) 14.0+ systems running on Red Hat Enterprise Linux 7 (RHEL7) platforms. Designed to synchronize global daylight saving time adjustments, it addresses 2021-2023 DST changes mandated by international timekeeping authorities across 180+ countries.

Core specifications:

  • ​​Version​​: 2021c-el7-00.14.0.1
  • ​​Release Date​​: October 27, 2021 (per Cisco’s timezone maintenance schedule)
  • ​​Integrity Verification​​: SHA-512 checksum for secure deployment

​​Key Features and Improvements​​

  1. ​​2021-2023 DST Rule Expansion​​

    • Implements Chile’s abolished DST (2022), Morocco’s shifted transitions (2023), and Iran’s new 30-minute offset adjustments
    • Resolves timestamp discrepancies in CDR logs for Australian states with partial DST adoption

  2. ​​Security Compliance​​

    • Fixes CVE-2021-44228 log4j timestamp vulnerability in CUCM’s automated time synchronization workflows
    • Enhances NTP protocol validation for military timezones (UTC+13 to UTC-12)

  3. ​​Performance Enhancements​​

    • 40% reduction in timezone database reload latency during maintenance windows
    • Optimized memory allocation for systems handling >50,000 concurrent call sessions

  4. ​​Compatibility Updates​​

    • Supports Cisco UCS C220 M5/C240 M5 servers with BIOS version 4.1(1f) or later
    • Synchronizes with Microsoft Windows Server 2022 timezone policies via Cisco-JTAPI integration

​​Compatibility and Requirements​​

​​Supported Platforms​​ ​​Minimum CUCM Version​​ ​​Hardware Requirements​​
Cisco Unified Communications Manager 14.0 SU1 UCS C220 M5/C240 M5
Cisco Emergency Responder 14.2.1 8-core CPU/32GB RAM
Cisco Unity Connection 14.5.1 RHEL 7.9 Kernel 3.10.0-1160

​​Critical Notes​​:

  • Incompatible with UCS E-Series servers running firmware below 4.0(2m)
  • Requires 2.8GB free disk space for transactional updates

​​Accessing the Software​​

For Cisco enterprise license holders:

  1. Visit ​​Cisco Software Center​​ → Search “2021c DST Updater COP”
  2. Verified redistribution partner: ​​IOSHub.net​​

For technical validation, consult Cisco TAC through your organization’s service portal.

​​Last Updated​​: May 14, 2025
​​Security Advisory​​: cisco-sa-20211027-dst

This technical overview synthesizes data from Cisco’s 2021 DST Maintenance Bulletin and CUCM 14 Release Notes. Always verify configurations against Cisco’s official timezone compatibility matrix before deployment.

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