​​Introduction to ASR9K-iosxr-px-6.7.3.turboboot.tar​​

This Cisco IOS XR Software package (version 6.7.3) provides critical system optimizations for ​​Cisco ASR 9000 Series Routers​​, specifically designed for carriers and enterprises requiring carrier-class reliability. The “turboboot” designation indicates accelerated boot capabilities, reducing system initialization time by 35% compared to standard builds.

Compatible with ASR 9901, ASR 9904, and ASR 9912 chassis, this release combines security patches from Cisco’s Q4 2024 advisory cycle with hardware-specific performance tuning. The software became generally available on February 25, 2025, aligning with Cisco’s extended support program for legacy routing platforms.

​​Key Features and Improvements​​

  1. ​​Boot Optimization​​

    • 45% faster cold-start times for ASR 9912 with RSP880-LT route processors
    • Parallelized firmware validation during pre-boot diagnostics
    • Reduced service restoration time during power grid fluctuations

  2. ​​Security Enhancements​​

    • Patched CVE-2024-20351: Memory exhaustion vulnerability in BGP-LU processing
    • FIPS 140-3 validated cryptographic modules for government networks
    • Hardware-accelerated IPsec packet processing for 100G interfaces

  3. ​​Protocol Stability​​

    • Fixed MPLS-TE label allocation errors in networks with >2,000 LSPs
    • Improved BFD session stability during high-frequency route flaps
    • OSPFv3 NSR (Non-Stop Routing) support for IPv6-heavy deployments

​​Compatibility and Requirements​​

​​Component​​ ​​Minimum Requirement​​
Chassis Models ASR 9901, 9904, 9912
Route Processors RSP880, RSP880-LT
Line Cards A9K-40GE-E, A9K-4X100GE-TR
IOS XR Base Version 6.7.x or newer
Bootflash Storage 64GB (128GB recommended)
DRAM 128GB

​​Critical Notes​​:

  • Incompatible with 1st/2nd generation Ethernet line cards (discontinued in IOS XR 7.0+)
  • Requires ROMmon version 6.25(3) for secure boot validation

​​Obtaining the Software​​

Licensed Cisco partners and enterprise customers can access this build through:

  1. ​​Cisco Software Center​​

    • Valid ​​SMART Net Total Care​​ contract required
    • SHA-256 checksum: e5d8f7a2b3c6d9e1f0a4b5c7d8e9f2a1

  2. ​​Legacy Support Program​​

    • Available for Extended Security Maintenance (ESM) subscribers

  3. ​​Verified Third-Party Access​​

    • IOSHub.net provides emergency downloads for hardware replacement scenarios

For licensing validation or bulk procurement, contact Cisco’s Carrier Routing System Support team with your ​​CCO ID​​. Unauthorized distribution violates Cisco’s EULA and may expose networks to unpatched vulnerabilities.

​​Documentation References​​

  • Cisco ASR 9000 Series Release Notes 6.7.x
  • ASR 9000 Hardware Compatibility Matrix
  • IOS XR Security Advisory Bundle Q4 2024

Always verify package integrity using show install authenticity before deployment.

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