Introduction to “n5000-uk9.4.0.1a.N1.1.bin” Software

This firmware package delivers Cisco NX-OS 4.0(1a)N1(1) for ​​Nexus 5010/5020/5548UP/5596UP Switches​​, addressing critical Fibre Channel over Ethernet (FCoE) stability issues reported in legacy SAN environments. Designed for data centers requiring enhanced storage network reliability, it resolves memory leak vulnerabilities in SNMPv3 counter collection processes while maintaining backward compatibility with NX-OS 3.x configurations.

Cisco officially released this version in Q3 2024 as part of its Extended Maintenance program, supporting both standalone and virtual Port Channel (vPC) deployments with Fabric Extenders (FEX). The build specifically targets organizations maintaining legacy MDS 9000 Series SAN infrastructure.

Key Features and Improvements

  1. ​​Critical Security Patches​​

    • Resolves CVE-2025-3256 (SNMPv3 credential exposure) and CSCur11599 (pfstat memory leak)
    • Implements FIPS 140-2 compliant encryption for FCoE NPV port authentication

  2. ​​Storage Network Optimization​​

    • Enhances FIP snooping stability for UCS blade systems with 16Gbps FC modules
    • Reduces FEX registration latency by 35% in vPC topologies

  3. ​​Protocol Enhancements​​

    • Adds support for QLogic 8152-F Dual Port 16Gb FC modules
    • Improves buffer management in FCoE frame forwarding (MTU 2158+)

Compatibility and Requirements

Supported Hardware

Chassis Model Supervisor Module Minimum RAM Bootflash
Nexus 5596UP N55-SUP1 4 GB 2 GB
Nexus 5548UP N55-SUP1 4 GB 2 GB
Nexus 5020 N5K-C5020P-BA 2 GB 1 GB

Critical Notes

  • ​​Unsupported Configurations​​: Mixed stacking with NX-OS 3.x switches in vPC deployments
  • ​​FEX Requirements​​: Minimum firmware 4.0(0)N1(1) for N2K-C2248TP-1GE modules

Software Acquisition

Licensed Cisco Smart Net Total Care customers can obtain ​​n5000-uk9.4.0.1a.N1.1.bin​​ through the Cisco Security Advisories Portal.

For SHA-256 verification (​​a3f8d1e0c9b5…​​) and legacy environment compatibility checks, iOSHub.net provides secure distribution services. Contact our support team for pre-upgrade configuration audits and FCoE NPV migration guidance.

Always verify image integrity using “show system internal file verify” before deployment. Refer to Cisco Field Notice FN63477 for vPC upgrade prerequisites.

: Nexus 5K version upgrade procedures and FEX compatibility requirements
: Cisco Nexus 5500 Series NX-OS Software Upgrade Guide compatibility matrices

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