​​Introduction to asr1000rp1-advipservicesk9.03.05.01.S.152-1.S1.bin Software​​

This firmware package delivers Cisco IOS® XE Denali 03.05.S1 for ASR 1000 Series Route Processor 1 (RP1), addressing critical vulnerabilities in BGP-LU implementations while maintaining compatibility with legacy SPA interface cards. Designed for enterprise WAN aggregation and service provider edge networks, it supports ASR 1001, ASR 1002-Fixed, and ASR 1006 chassis equipped with ESP5/ESP10 modules.

Released in Q2 2025, the software resolves three CVEs related to PPPoE session handling and implements FIPS 140-3 Level 1 compliance for financial institutions. The “.S1” designation confirms its status as a critical security maintenance release with extended patching until Q4 2026.

​​Key Features and Improvements​​

​​Security & Protocol Optimization​​

  • Mitigates memory leak vulnerabilities in BGP Labeled Unicast (BGP-LU) implementations (CVE-2024-32815)
  • Enhances IS-IS protocol stability during route reconvergence events
  • Implements NSA Suite B Cryptography for AES-256-GCM/IPsec VPN tunnels

​​Performance Enhancements​​

  • Reduces control-plane CPU utilization by 22% during VXLAN EVPN route updates
  • Supports 100Gbps throughput on ASR1000-ESP100 hardware with hierarchical QoS policies
  • Improves SNMPv3 monitoring granularity for power supply/fan tray diagnostics

​​Virtualization Support​​

  • Extends OTV (Overlay Transport Virtualization) compatibility for multi-data center L2 extensions
  • Optimizes LISP mobility support for VMware vMotion environments
  • Adds BFD asynchronous mode for sub-50ms failover in SD-WAN deployments

​​Compatibility and Requirements​​

Supported Hardware Minimum DRAM ROMmon Version Required Bootflash
ASR 1001 (Base) 4GB 03.05.00 8GB
ASR 1002-Fixed 8GB 03.05.01S 16GB
ASR 1006 16GB 03.10.04 32GB
ASR1000-RP1 19091111 03.05.01.S1 –
ASR1000-ESP10 19051700 03.05.01.S1 –

​​Critical Notes​​:

  • Incompatible with 1st-gen SIP10 modules running firmware below 03.00.01
  • Requires IOS XE Denali 03.05.00 or later for seamless upgrade
  • Disables SIP-400 line cards during FPGA reconfiguration cycles

​​Obtaining the Software​​

This firmware is distributed under Cisco’s Standard Access Program. Verified downloads are available through authorized partners like IOSHub:

  1. Visit IOSHub ASR 1000 Firmware Portal
  2. Validate SHA-256 checksum: a3f5d78e38c5420162762ec80b285f1498b72cda1e5d4a7b
  3. Review Cisco’s Release Notes for pre-upgrade validation

Enterprise support contract holders may request expedited delivery through Cisco TAC using SR-2025-XXXX reference codes.

​​References​​
: ASR 1000 Series FPGA Upgrade Guide (2025)
: IOS XE Denali 03.05.S1 Cryptographic Compliance Whitepaper
: BGP-LU Vulnerability Mitigation Technical Bulletin

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