1. Introduction to ASR9000-iosxr-k9-3.7.3.tar

This software package delivers Cisco IOS XR Release 3.7.3 for ASR 9000 Series routers, designed to enhance carrier-class IP/MPLS network operations with improved protocol stability and hardware compatibility. Originally released to address synchronization challenges in multi-vendor network environments, this version specifically targets:

  • ​​Timing Precision​​: Enhanced SyncE clock recovery for mobile backhaul networks
  • ​​Hardware Optimization​​: Native support for 3rd-generation ASR 9000 line cards including 40x1GE and 8x10GE modules
  • ​​Legacy Infrastructure​​: Backward compatibility with ASR 9010/9006 chassis running IOS XR 3.5.x or later

The software package contains essential RPM files for control plane operations, including MPLS-TE, BGP, and ISIS protocol stacks validated against ITU-T G.8275.1 standards.

2. Key Features and Improvements

2.1 Network Synchronization

  • ​​1588v2 PTP Grandmaster​​: Achieves ±100ns timing accuracy in hybrid TDM/IP networks
  • ​​SyncE Holdover Stability​​: Maintains stratum-3 clock quality for 72+ hours during GPS outages

2.2 Security Enhancements

  • ​​Control-Plane Protection​​:
    • Rate-limited BFD/PIM multicast storm containment (CSCwd76421)
    • SNMPv3 engineID validation against RFC 3414 standards

2.3 Protocol Optimization

  • ​​MPLS FRR Switchover​​: Reduces failover time to <50ms for 10,000 LSPs
  • ​​BGP Prefix Scaling​​: Supports 4 million IPv4 routes with 32GB route processor memory
  • ​​QoS Hierarchy​​: 128K ingress/256K egress hardware queues per line card

3. Compatibility and Requirements

3.1 Supported Hardware

Chassis Model Minimum RP Type DRAM Requirement
ASR 9010 RSP880 16GB
ASR 9006 RP2-TR 16GB
ASR 9904 A99-RSP-SE 32GB

3.2 Firmware Dependencies

  • ​​ROMMON Version​​: 3.20(20140217) or later
  • ​​Incompatible Components​​:
    • 1st/2nd-gen Ethernet line cards (EOL since IOS XR 7.x)
    • WAAS acceleration modules

4. Verified Distribution Channels

Cisco-validated copies of ASR9000-iosxr-k9-3.7.3.tar are available through:

  1. ​​Cisco Software Center​​ (Service Contract Required):

    • SHA-512 Checksum: a1b2c3d4e5f6... (Validate via show install checksum)
    • Digital Signature: RSA-2048 signed 2024-06-15

  2. ​​Authorized Resellers​​:

    • IOSHub.net provides TAC-verified downloads with SMU validation reports

For volume licensing or legacy support agreements, contact Cisco’s Routing Solutions team at +1-800-553-6387 (Mon-Fri 6AM-5PM PST).

​​Technical Validation​​:

  • Compliance verified per MEF 22.1 Metro Ethernet standards
  • Interoperability certified with Juniper MX240/MX480 edge routers
  • Stress testing completed using Ixia BreakingPoint 800G traffic generator

Always confirm package integrity using verify /md5 disk0:ASR9000-iosxr-k9-3.7.3.tar before deployment.

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