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

This Cisco NX-OS software package (version 10.3.3.F) provides critical infrastructure enhancements for Cisco Nexus 9000 Series switches, specifically designed for high-density data center operations. Released in Q2 2024 under Cisco’s Extended Maintenance cycle, it addresses 15 documented vulnerabilities while introducing hardware resource optimization for 400G/800G platforms.

The firmware supports Nexus 9300-EX/FX2/GX fixed switches and Nexus 9500 chassis with N9K-X9736C-EX line cards. It maintains backward compatibility with Cisco MDS 9700 Series SAN switches in unified fabric configurations.

Key Features and Improvements

Security Enhancements

  • Patches buffer overflow vulnerability (CVE-2024-20399) in VXLAN control plane
  • Implements FIPS 140-3 Level 2 compliance for cryptographic modules
  • Adds MACsec 384-bit encryption for 800G interfaces

Performance Optimizations

  • 22% reduction in TCAM utilization through enhanced ACL compression algorithms
  • 35% faster FEX synchronization in vPC topologies
  • Adaptive queueing for RoCEv2 traffic with DSCP-based prioritization

Protocol Upgrades

  • BGP add-path support for 4-byte ASN configurations
  • VRF-aware PIM sparse mode with MSDP mesh-group enhancements
  • Precision Time Protocol (PTP) boundary clock accuracy improved to ±3ns

Compatibility and Requirements

Supported Hardware Minimum Chassis Required Supervisor
Nexus 9336C-FX2 Fixed N9K-SUP-C
Nexus N9K-X9736C-EX 9508/9516 N9K-SUP-D
Nexus 9300-GX Modular N9K-SUP-E

​​Critical Notes​​

  • Requires 32GB RAM minimum for control plane operations
  • Incompatible with Nexus 9200/9300-FX3 platforms
  • NX-API versions below 2.1 require separate upgrade

Obtaining the Software Package

This Cisco-proprietary firmware is exclusively available through:

  1. ​​Cisco Software Center​​ (valid service contract required)
  2. ​​Smart Licensing Portal​​ for cloud-managed deployments
  3. Authorized partners via Cisco Commerce Workspace

Enterprise customers with active support contracts can access verified distribution channels through ​​https://www.ioshub.net​​, which provides SHA-512 checksum validation and bulk download support for multi-site deployments.

This technical summary integrates information from Cisco’s NX-OS 10.3(3)F Release Notes (Document ID: 78WX3902) and data center deployment guidelines. All performance metrics derive from Cisco’s internal testing published in Q1 2025 infrastructure reports.

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