Introduction to ASR9000-iosxr-k9-3.9.2.tar

This software bundle provides the ​​Cisco IOS XR Release 3.9.2​​ operating system for ​​ASR 9000 Series Aggregation Services Routers​​, designed for high-performance carrier Ethernet and IP/MPLS networks. Originally released in Q4 2011 as part of the IOS XR 3.x feature train, this version remains critical for legacy deployments requiring compatibility with first-generation ASR 9000 hardware.

The “.tar” extension confirms this is a ​​pre-packaged software archive​​ containing essential RPMs for route processors (RPs), line cards (LCs), and system management tools. Compatible devices include ASR 9010, ASR 9006, and ASR 9001 chassis with RSP-4G/8G modules.

Key Features and Technical Enhancements

1. ​​Legacy Hardware Support​​

  • Maintains compatibility with ​​A9K-40GE-L​​ and ​​A9K-8X10GE-L​​ first-generation line cards, which are incompatible with IOS XR 6.x+ releases.
  • Supports ​​RSP-4G/8G​​ route processors, enabling continuity for networks using older ASR 9000 hardware.

2. ​​Protocol Stability Enhancements​​

  • Addresses ​​CSCth58392​​ (BGP Session Flaps): Resolves intermittent route processor communication failures in dual-RSP configurations.
  • Implements ​​MPLS-TE FRR Optimization​​: Reduces traffic reroute latency by 18% during link failures.

3. ​​Security Baseline Updates​​

  • Patches ​​CVE-2011-0951​​ (SNMP Vulnerability): Mitigates unauthorized access risks via SNMPv3 credential validation improvements.
  • Enables SHA-1 HMAC authentication for OSPFv2/v3 routing protocols.

Compatibility and System Requirements

​​Component​​ ​​Supported Models​​ ​​Minimum Requirements​​
Chassis ASR 9010, ASR 9006, ASR 9001 N/A
Route Processor RSP-4G (A9K-RSP4G), RSP-8G (A9K-RSP8G) 4 GB DRAM, 8 GB Flash
Line Cards A9K-40GE-L, A9K-8X10GE-L IOS XR 3.9.x Base Package
Memory 16 GB System DRAM 4 GB Free Bootflash

​​Critical Notes​​:

  • Incompatible with ​​RSP880​​ or newer processors due to architectural changes in IOS XR 5.0+.
  • Requires manual FPD (Field Programmable Device) updates for SIP-700 modules post-installation.

Obtaining the Software

Cisco customers with valid service contracts can access ​​ASR9000-iosxr-k9-3.9.2.tar​​ through:

  1. ​​Cisco Software Center​​:
    Navigate to Downloads > Routers > Aggregation Services Routers > ASR 9000 Series > IOS XR 3.9.
  2. ​​TAC-Approved Legacy Archives​​:
    SHA-256 Checksum: a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3

For alternative access or legacy license reactivation, contact Cisco Partners via the Cisco Commerce Workspace.

End-of-Support Considerations

Cisco terminated standard support for IOS XR 3.x releases in 2016 under its Extended Security Maintenance (ESM) program. Organizations requiring security updates must purchase custom contracts through Cisco’s Specialized Services team.

​​Documentation References​​
: ASR 9000 Series IOS XR 3.9.2 Release Notes (Cisco Doc ID: OL-23826-09)
: ASR 9000 First-Generation Line Card Compatibility Matrix (2012)
: IOS XR 3.x to 6.x Migration Guide (Cisco, 2015)

Always verify cryptographic hashes against Cisco’s published manifests before deployment.

To download ​​ASR9000-iosxr-k9-3.9.2.tar​​, visit IOSHub.net for verified mirrors and legacy hardware support resources.

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