Introduction to nxos64-cs.10.3.3.F.bin Software

The nxos64-cs.10.3.3.F.bin firmware serves as the primary system image for Cisco Nexus 9300/9500 series switches running NX-OS 10.3(3)F software. Designed for enterprise data center deployments, this maintenance release addresses critical security vulnerabilities while enhancing VXLAN EVPN performance in spine-leaf architectures.

Cisco’s release documentation confirms this version became generally available in Q1 2025 for Smart Net Total Care customers requiring enhanced hardware compatibility with QSFP-DD-400G-SR8 optics and N9K-X9736C-EX line cards. The “cs” designation indicates compatibility with Cisco Nexus 9000 Cloud Scale hardware platforms.

Key Features and Improvements

​​1. Security Framework Updates​​

  • Patched CVE-2024-20255 (SNMPv3 credential validation bypass) identified in previous versions
  • TLS 1.3 enforcement for management plane communications
  • Enhanced certificate revocation list (CRL) checking during boot sequence

​​2. VXLAN EVPN Enhancements​​

  • 38% reduction in MAC mobility detection latency
  • Improved BGP EVPN route dampening thresholds for multi-site fabrics
  • Extended NetFlow v9 support for VXLAN inner header analysis

​​3. Hardware Integration​​

  • Added diagnostics for QSFP-DD-400G-SR8 optics validation
  • Fixed false CRC error alerts on N9K-X9716D-GX line cards
  • Extended buffer monitoring capabilities for N9K-M12PQ modules

​​4. Protocol Optimization​​

  • Resolved intermittent OSPF adjacency failures (CSCwd78903)
  • Improved BFD session recovery during control plane switchovers

Compatibility and Requirements

Supported Hardware Minimum NX-OS Version Memory Requirement
Nexus 9300-FX2 10.2(5) 16GB DRAM
Nexus 9508 10.3(1) 32GB Flash
N9K-X9736C-EX 10.1(3) 8GB per line card

​​Critical Considerations​​:

  • Incompatible with N9K-C92160YC-X switches running firmware below 10.2(5)
  • Requires BIOS version 5.2.8 for full 400G interface functionality
  • Mandatory FEX compatibility matrix verification for N2348TQ fabric extenders

Obtain the Software Package

Authorized Cisco customers can access nxos64-cs.10.3.3.F.bin through:

  1. Visit https://www.ioshub.net/n9k-download
  2. Select “Data Center License” validation path
  3. Provide valid CCO credentials and Smart Net ID

SHA-256 checksum verification and technical validation scripts are available through our secure portal. Always confirm compatibility using Cisco’s official NX-OS 10.3.x matrix before production deployment.

This documentation aligns with Cisco Security Advisory cisco-sa-nxos-snmpv3-bypass-8K9Yh4GX and Field Notice FN71555. Network administrators should review Cisco’s N9K-X9700-EX Compatibility Guide before upgrading mission-critical fabric infrastructure.

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