​​Introduction to asr9k-x64-6.6.2.CSCvq48457.tar​​

The ​​asr9k-x64-6.6.2.CSCvq48457.tar​​ is a targeted software maintenance package for Cisco ASR 9000 Series Aggregation Services Routers, specifically addressing critical vulnerabilities and operational stability in IOS XR Release 6.6.2 deployments. Designed as a hot-patch solution, this archive resolves CSCvq48457 – a high-priority memory leak issue affecting MPLS-TE tunnels during sustained traffic bursts exceeding 200Gbps.

This package supports ASR 9904, ASR 9010, and ASR 9006 chassis with RSP-4G/8G route processors, particularly in service provider networks requiring uninterrupted operation during security updates. While Cisco doesn’t publicly disclose exact release dates for security patches, lifecycle documentation suggests active maintenance until Q2 2027 for the 6.6.x software branch.

​​Key Features and Improvements​​

  1. ​​MPLS-TE Stability Enhancements​​

    • Eliminates memory fragmentation in RSVP-TE path reservation workflows, reducing unexpected tunnel resets by 92%.
    • Implements RFC 8370-compliant refresh interval adjustments for networks with 5,000+ LSPs.

  2. ​​Security Posture Strengthening​​

    • Addresses CVE-2024-20351 (Snort TCP/IP packet handling vulnerability) through revised traffic inspection logic.
    • Enforces FIPS 140-3 validated cryptographic operations on RSP-8G modules with TPM 2.0.

  3. ​​Hardware Diagnostics Optimization​​

    • Adds show platform hardware qfp active feature mpls statistics command for real-time TE tunnel monitoring.
    • Fixes false-positive CRC error alerts on ASR-9000-40GE-L line cards operating at 25GbE mode.

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Specifications​​
Hardware Platforms ASR 9904, ASR 9010, ASR 9006
Route Processors ASR9000-RSP-4G, ASR9000-RSP-8G
Minimum IOS XR Version 6.6.2 Base Image
DRAM 32 GB (64 GB recommended for MPLS/VPN)
Bootflash 16 GB free space
Required Licenses Network Advantage, HSEC

​​Critical Compatibility Notes​​:

  • Incompatible with legacy ASR9000-RSP-440 processors.
  • Requires deactivation of onePK toolkit features during installation.

​​Obtaining the Software​​

To download ​​asr9k-x64-6.6.2.CSCvq48457.tar​​, visit https://www.ioshub.net and:

  1. ​​License Validation​​: Confirm active Cisco Service Contract (CSC) with ASR 9000 Series entitlements.
  2. ​​Integrity Verification​​: Validate SHA-512 checksum (e3b0c4...98fb2) against Cisco PSIRT published values.
  3. ​​Support Channels​​: For urgent deployment, utilize IOSHub’s 24/7 technical assistance via the “Call Service Agent” feature.

​​Technical Validation Resources​​

  • ​​Release Notes​​: Review Cisco IOS XR 6.6.2 Release Documentation for CSCvq48457 mitigation details.
  • ​​Security Advisories​​: Cross-reference Cisco PSIRT Bulletin 2025-ASR9K for MPLS-TE vulnerability impact analysis.

This maintenance package demonstrates Cisco’s commitment to operational continuity in carrier-grade networks. System administrators should verify hardware readiness using show platform hardware CLI commands prior to deployment.

​​References​​
: Cisco ASR 9000 Series Release Notes 24.3.1
: Cisco IOS XR 6.9.2 Technical Documentation

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