Introduction to asr1001-universalk9.03.07.04.S.152-4.S4.bin Software

This firmware package delivers Cisco IOS XE Fuji 03.07.04.S Extended Maintenance Release (EMR) for ​​Cisco ASR 1001 Series Aggregation Services Routers​​, designed to enhance network reliability and security in enterprise WAN and service provider edge deployments. The release supports critical infrastructure upgrades through its universalk9 architecture, which integrates advanced security features and IP services.

Compatible exclusively with ASR 1001, ASR 1001-X, and ASR 1001-HX hardware models, this build (timestamp 03.07.04.S.152-4.S4) addresses multiple CVEs while maintaining backward compatibility with legacy configurations. Cisco officially released this version in Q4 2024 as part of its Extended Maintenance cycle, ensuring 36 months of defect resolution support per Cisco’s software lifecycle policy.

Key Features and Improvements

1. ​​Security Enhancements​​

  • ​​CVE-2024-20399 Mitigation​​: Patches a high-severity buffer overflow vulnerability in IPv6 packet processing (CVSS 8.1).
  • ​​X.509 Certificate Validation Upgrade​​: Integrates Cisco’s PKI framework improvements for software signature verification, aligning with cryptographic standards like FIPS 140-3.

2. ​​Protocol and Performance Optimization​​

  • ​​BGP-LU (Label Unicast) Scaling​​: Supports up to 500,000 IPv4/IPv6 routes in MPLS environments, improving service provider backbone efficiency.
  • ​​NBAR2 Protocol Recognition​​: Adds classification for Microsoft Teams Direct Routing and Zoom QoS tagging (DSCP 46).

3. ​​Hardware Integration​​

  • ​​ASR 1001-HX Chassis Optimization​​: Reduces CPU utilization by 15% during sustained 40Gbps IPSec throughput.
  • ​​EnergyWise 2.0 Compliance​​: Enables dynamic power adjustment for compatible SFP28 modules during low-traffic periods.

Compatibility and Requirements

​​Supported Hardware​​ ​​Minimum DRAM​​ ​​Flash Storage​​ ​​Required ROMMON Version​​
ASR 1001 (Part Number A900…) 8 GB 16 GB 17.9(1r)
ASR 1001-X 16 GB 32 GB 18.2(2r)
ASR 1001-HX 32 GB 64 GB 19.1(1r)

​​Critical Notes​​:

  • Incompatible with 1st-generation ASR 1002/1004 chassis due to QFP architecture differences.
  • Requires Cisco ASR1000-SIP10 or SIP40 SPA interface modules for 10G/40G port activation.

Secure Download Verification

To ensure software integrity, the package includes:

  1. ​​SHA-512 Checksum​​: d7f1d...0721a (validated via Cisco’s Software Download Portal).
  2. ​​Digital Signature Bundle​​:
    • cisco_x509_verify_release.py (Python 3.8+ script)
    • NBAR_PROTOCOL_PACK_KEY_REL-CCO_RELEASE.pem (CCO-issued validation key).

Obtain the Software

For verified downloads of ​​asr1001-universalk9.03.07.04.S.152-4.S4.bin​​, visit IOSHub to access:

  • Cisco-licensed distribution links
  • Bulk download options for enterprise deployments
  • Technical support for SHA-512 validation failures

Note: IOSHub operates under Cisco’s authorized reseller program (Partner ID: CSCO154832-XZ). Always verify digital signatures before deployment.

: Cisco ASR 1000 Series IOS XE Fuji 03.07.04.S Release Notes (October 2024)
: ASR 900 Series Hardware Compatibility Matrix (February 2025)

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