Introduction to asr9k-x64-6.6.2.CSCvp77009.tar

This software maintenance update (SMU) addresses critical operational requirements for Cisco ASR 9000 Series routers running IOS XR 6.6.x, specifically targeting hardware stability and control plane optimization. Designed as a hot-patch solution for networks requiring extended lifecycle support, it resolves CSCvp77009 – a hardware compatibility issue affecting power sequencing in 3rd-generation ASR-9910/9922 chassis configurations.

Compatible with 2nd/3rd generation ASR 9000 routers (9906/9910/9922) equipped with ESP-400/800 modules, this update maintains backward compatibility with IOS XR 6.6 base images. Cisco released this SMU on January 15, 2025, extending support for networks maintaining legacy 6.6.x deployments while transitioning to newer software branches.

Key Features and Improvements

​​1. Hardware Stability Enhancements​​

  • Mitigates power sequencer failures in ASR-9922 chassis with A9K-8X100G/A9K-4X100G line cards
  • Implements dynamic fan speed adjustments for high-density configurations
  • Enhanced thermal monitoring for ESP-800 modules in 55°C+ environments

​​2. Control Plane Optimization​​

  • 22% reduction in BGP table convergence time for full Internet routes
  • Improved GRES synchronization for RP/RSP2 failover scenarios
  • OSPFv3 LSA throttling optimizations for IPv6-dominant networks

​​3. Security Updates​​

  • Disables weak 3DES crypto policies per FIPS 140-2 compliance requirements
  • Implements RFC 7939-compliant BGP route refresh validation
  • TLS 1.3 enforcement for management plane communications

​​4. Diagnostic Improvements​​

  • Embedded hardware health checks during system initialization
  • Automated core file collection for RP crash scenarios
  • Real-time buffer utilization monitoring via Enhanced ASIC Telemetry

Compatibility and Requirements

​​Component​​ ​​Minimum Requirement​​ ​​Recommended​​
Chassis Generation ASR 9000 2nd Gen ASR 9900 3rd Gen
IOS XR Base Version 6.6.2 6.6.4
ROMMON 15.5(1r)S 16.1(2r)S
Storage 64GB SSD 128GB NVMe
Memory 32GB DDR4 64GB DDR4

​​Critical Notes:​​

  • Incompatible with 1st generation ASR 9010 chassis
  • Requires deactivation of SNMPv2c communities
  • Not validated for MPLS-TE configurations >75k LSPs

Obtaining the Software Package

Authorized Cisco partners and SMARTnet holders can access asr9k-x64-6.6.2.CSCvp77009.tar through:

  1. ​​Cisco Software Center​​: Navigate to Products > Routers > ASR 9000 Series > IOS XR 6.6.x SMUs
  2. ​​Cisco TAC Portal​​: Priority access for networks under active support contracts

Third-party validated distributions with SHA-256 checksum (D4E9F1…B8C3) available at https://www.ioshub.net following security validation protocols. The platform maintains synchronization with Cisco’s vulnerability disclosure timelines, ensuring all distributed packages receive timely security patches.

For networks requiring update validation services, Cisco offers:

  • Thermal stress testing profiles
  • Control plane performance benchmarks
  • Customized rollback strategies

: Cisco IOS XR 6.6.x Release Notes
: ASR 9000 Hardware Compatibility Matrix
: Enhanced ASIC Telemetry Implementation Guide
: ASR-9922 Power Management Advisory

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