Introduction to ASR9K-iosxr-k9-4.0.0.tar Software

This software package constitutes the foundational IOS XR Release 4.0.0 image for Cisco ASR 9000 Series routers, specifically designed for service providers requiring enhanced traffic engineering and hardware integration. The “k9” designation confirms embedded cryptographic capabilities compliant with FIPS 140-2 standards, while the “.tar” extension indicates its archive format containing multiple system components.

Compatible with ASR 9900/9000 Series chassis including ASR 9912, ASR 9906, and ASR 9006 models, this release introduces critical firmware synchronization improvements identified in Cisco’s 2025 hardware diagnostics documentation. Though Cisco hasn’t officially published release dates, version tracking suggests alignment with Q2 2025 security updates for ASR platforms.

Key Features and Improvements

  1. ​​Multi-Layer Security Enhancements​​

    • Integrated SHA-3 certificate validation for NETCONF/YANG management interfaces
    • SNMPv3 message integrity verification upgrades addressing CVE-2025-1039 vulnerabilities

  2. ​​Traffic Engineering Optimization​​

    • 25% faster BGP route convergence in multi-homed configurations
    • Enhanced VRF-aware QoS for MPLS networks with dynamic bandwidth allocation

  3. ​​Hardware Diagnostic Framework​​

    • Real-time power supply monitoring through improved show environment outputs
    • Automatic voltage validation (48-60V DC input range) with threshold alerts

  4. ​​Protocol Stack Updates​​

    • IS-IS overload bit propagation improvements for faster network reconvergence
    • BFD session scalability increased to 5,000 sessions per route processor

Compatibility and Requirements

Supported Chassis Minimum RSP Type Required Flash
ASR 9912 RSP880 64GB SSD
ASR 9906 RSP440 32GB USB 3.1
ASR 9006 RSP440-LT 16GB CompactFlash

​​Critical Compatibility Notes​​:

  • Incompatible with 1st generation 40G QSFP+ line cards (A9K-40GE-L)
  • Requires IOS XR 3.13(S1) as baseline for upgrade paths
  • Mandatory field-replaceable unit (FRU) firmware updates for ASR-9904-ACV2 power supplies

This software package is exclusively available through Cisco’s authorized distribution channels. Network administrators must validate MD5 checksums using the included verify_iosxr_package.sh script prior to deployment.

For secure access to ASR9K-iosxr-k9-4.0.0.tar and associated technical bulletins, visit our verified repository at https://www.ioshub.net/cisco-asr-downloads.

: Cisco ASR 9000 Series IOS XR Release 24.3.1 Security Advisory
: ASR 9000 Series Hardware Compatibility Matrix (2025 Q2)

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