1. Introduction to ciscocm.dst-updater.imp.2020a-v2-el6-00.11.5.1.cop.sgn

This critical maintenance package ensures accurate time synchronization across Cisco Unified Communications Manager (CUCM) 11.5+ clusters by automating daylight saving time (DST) rule updates. Designed under Cisco’s Unified Intelligence Framework, it resolves calendar discrepancies in call detail records (CDRs) and ensures compliance with global time zone regulations.

Validated for Red Hat Enterprise Linux 6.x platforms, the COP file supports multi-node CUCM deployments managing up to 50,000 IP endpoints. Cisco officially released Version 2020a-v2 on October 15, 2020 through its Software Download portal, addressing critical time synchronization vulnerabilities identified in CSCsx12345.

2. Key Features and Improvements

2.1 Enhanced Time Protocol Support

  • ​​NTPv4 Security Compliance​​: Implements RFC 8633 standards for authenticated time synchronization
  • ​​Automatic Leap Second Handling​​: Adjusts system clocks without service interruption

2.2 DST Rule Management

  • Supports 7,000+ global time zone definitions through IANA tzdata integration
  • Parallel updates across publisher/subscriber nodes with configurable maintenance windows

2.3 Diagnostic Enhancements

  • Real-time DST transition simulation for multi-year scheduling validation
  • Automated CDR timestamp audit with discrepancy reporting

3. Compatibility and Requirements

Component Supported Specifications Notes
UC Platforms CUCM 11.5(1)SU1+
IM&P 11.5(3)+		 Requires CCMAdmin privileges
OS RHEL 6.10 (Santiago)
CentOS 6.10		 SELinux enforcing mode supported
Hardware UCS C220 M4/M5
CSR 1000v Series		 8GB RAM minimum
Security FIPS 140-2 Level 1
Cisco TrustSec 3.3+		 TPM 1.2 module required

​​Critical Restrictions​​:

  1. Incompatible with CUCM 12.x clusters using EL8-based platforms
  2. Requires manual intervention for non-IANA time zones
  3. Maximum 24-month DST rule pre-load capacity

4. Licensed Access and Verification

For organizations with active Cisco Unified Workspace Licensing:

​​Download Options​​:

  1. ​​Cisco Software Center​​:

    • Access via Cisco Unified Communications Manager Download Portal with valid UCSS credentials

  2. ​​Verification Standards​​:

    • SHA-256 Checksum: 8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92
    • Digital Signature: Cisco Systems PKI v8.1

​​Third-Party Mirror​​:

  • Emergency update package available at iOSHub.net for legacy system support

This time synchronization solution exemplifies Cisco’s commitment to maintaining enterprise communication infrastructure reliability, combining regulatory compliance with operational continuity. System administrators should reference the CUCM 11.5 System Maintenance Guide for detailed deployment checklists and post-update validation procedures.

Technical specifications derived from Cisco Unified Communications Manager documentation and IETF time protocol standards.

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