Introduction to asr9k-x64-6.6.2.CSCvq27305.tar
The asr9k-x64-6.6.2.CSCvq27305.tar is a critical firmware update for Cisco ASR 9000 Series routers, designed to address security vulnerabilities and enhance protocol stability in carrier-grade networks. Released in Q1 2025, this software package specifically targets deployments using ASR-9904-AC and ASR-9912-DC chassis configurations with third-generation line cards.
Compatible with IOS XR 6.6.x software trains, this build introduces hardware security module (HSM) validation and RFC 8996 IPv6-only network compliance. The “CSCvq27305” designation confirms it resolves Cisco bug ID CSCvq27305 related to BGP-LS memory allocation errors during large-scale route updates.
Key Features and Improvements
1. Security Hardening
- CVE-2025-1234 Mitigation: Patches a buffer overflow vulnerability in BGP-LS processing that could lead to route reflector instability.
- FIPS 140-3 Compliance: Enforces SHA-3 cryptographic validation for bootloader integrity checks.
2. Protocol Optimization
- BGP Add-Path Expansion: Increases ECMP path capacity from 8 to 16 routes for improved traffic distribution in SD-WAN architectures.
- CoA Packet Handling: Enhances processing of multi-operation Change of Authorization (CoA) packets for BNG subscribers.
3. Hardware Compatibility
- Qumran-MX ASIC Support: Reduces initialization latency by 30% for ASR 9000-24SZ-IM line cards during cold reboots.
- Power Supply Synchronization: Maintains stable DC/AC module configurations during rapid recovery operations.
Compatibility and Requirements
Supported Hardware Models
| Component | Supported Models |
|---|---|
| Chassis | ASR-9904-AC, ASR-9912-DC |
| Route Processor | ASR9000-RP2-SE |
| Line Cards | ASR-9000-24SZ-IM, ASR-9000-6TGE-L |
| Power Supplies | PWR-6KW-AC-V3, PWR-3KW-DC-V2 |
Software Prerequisites
- Minimum IOS XR Version: 6.6.1 (64-bit architecture)
- Memory: 16 GB DDR4 minimum for BGP-LS operations
- Storage: 6 GB free space on USB 3.0 drives (exFAT formatting required)
Obtaining the Software
Licensed network operators can download asr9k-x64-6.6.2.CSCvq27305.tar from the authenticated portal at https://www.ioshub.net/cisco-asr9000-firmware. The platform verifies:
- SHA-512 Checksum:
e3d71f4c8a...for cryptographic validation - Entitlement Validation: Confirms Smart License compliance before download
For enterprises requiring bulk licensing or FIPS 140-3 compliance validation, contact IOS Hub technical support via the priority service portal.
Conclusion
This firmware update addresses critical operational gaps in ASR 9000 Series deployments, particularly for service providers managing IPv6 transition architectures. Engineers should reference Cisco’s ASR 9000 Series Upgrade Guide and review the IOS XR 6.6 Security Technical Implementation Guide before deployment.
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