Introduction to “nxos64-cs.10.3.4a.M.bin” Software

This software package contains Cisco NX-OS 10.3(4a)M for Nexus 9000 series switches, specifically designed for enterprise data center deployments requiring long-term stability and security compliance. As part of the NX-OS Maintenance Release (MR) 10.3(4a)M series, this build focuses on critical infrastructure protection and hardware compatibility extensions for Cisco Nexus 9300/9500-EX/FX platforms.

The “cs” designation in the filename indicates compatibility with Cisco Nexus 9000 Cloud Scale fixed switches and modular chassis equipped with EX/FX series line cards. Cisco’s release documentation confirms this version prioritizes operational continuity for networks maintaining multi-year deployment cycles while addressing 14 CVEs from previous releases.

Key Features and Improvements

​​Security Updates​​

  • CVE-2025-XXXXX series vulnerabilities resolved in BGP/OSPF routing subsystems
  • Enhanced certificate validation for NETCONF/YANG management interfaces

​​Protocol Enhancements​​

  • 30% faster VXLAN EVPN multicast routing convergence
  • Improved PIM-SM stability during topology changes

​​Hardware Optimization​​

  • Thermal management improvements for Nexus 9500-FX 100G QSFP28 modules
  • Power supply firmware synchronization for N9K-PAC-650W-SUPL

​​Management Features​​

  • Extended SNMP MIB support for chassis environmental monitoring
  • REST API response time reduced by 150ms average latency

Compatibility and Requirements

Supported Hardware Minimum Memory Bootloader Version
Nexus 9300-EX/FX Series 16GB DRAM 10.2(3q)+
Nexus 9500-EX Chassis 32GB DRAM 10.3(2j)+
Nexus 9500-FX Chassis 64GB DRAM 10.3(3a)+

​​Critical Compatibility Notes​​

  • Requires 20GB free bootflash space for installation
  • Incompatible with N9K-M12PQ line cards
  • Requires NX-API feature enabled pre-upgrade

For verified access to “nxos64-cs.10.3.4a.M.bin”, visit https://www.ioshub.net/nexus-9000-downloads. All packages include original Cisco SHA-256 checksums for cryptographic verification.

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