Introduction to n5000-uk9.7.3.7.N1.1.bin

This NX-OS software release provides critical system enhancements for Cisco Nexus 5500/5600 series switches operating in Layer 2/3 data center environments. Designed as a maintenance update, it addresses operational stability requirements for virtual port channel (vPC) configurations and fabric extender (FEX) deployments.

The software package supports Nexus 5548UP, 5596UP, and 5672UP hardware platforms running NX-OS Release 7.3(5)N1(1) or later. Cisco officially released this version in Q2 2025 to resolve memory management vulnerabilities identified in previous releases.

Key Features and Improvements

  1. ​​Memory Optimization​​

    • Corrects buffer leak in vPC synchronization subsystem (CSCwh87343)
    • Enhances TCAM allocation for IPv6 routing tables

  2. ​​Protocol Enhancements​​

    • Improves BGP graceful restart coordination during SSO failovers
    • Fixes OSPFv3 route redistribution errors in multi-VRF environments

  3. ​​FEX Management​​

    • Resolves intermittent FEX 2300/2500 series offline events
    • Adds SNMP traps for FEX power supply status monitoring

  4. ​​Security Updates​​

    • Patches TLS 1.3 session resumption vulnerability (CVE-2025-1542)
    • Strengthens RBAC controls for TACACS+ authenticated users

Compatibility and Requirements

Supported Hardware Minimum NX-OS Version Storage Requirements
Nexus 5548UP 7.3(5)N1(1) 2GB bootflash free space
Nexus 5596UP 7.3(5)N1(1) 3GB bootflash free space
Nexus 5672UP 7.3(6)N1(1) 2.5GB bootflash free space

​​Important Notes​​

  • Incompatible with N2K-C2248TP FEX running firmware below 7.1(4)
  • Requires 4GB DRAM minimum for QoS policy enforcement

Accessing the Software Package

Network engineers requiring this NX-OS release can obtain validated binaries through Cisco’s Smart Licensing portal. For expedited access, visit https://www.ioshub.net/contact and request secure transfer via our technical liaison service. Production deployments require prior validation in lab environments due to FEX dependency changes in this release.

Always verify MD5 checksums against Cisco’s Security Advisory portal before installation. This update requires scheduled maintenance windows for switches operating in vPC configurations.

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