Introduction to n5000-uk9-kickstart.5.0.2.N2.1.bin
This kickstart image provides core system initialization for Cisco Nexus 5548UP/5672UP switches running NX-OS Release 5.0(2)N2(1). Designed as the foundational bootloader component, it enables hardware diagnostics and modular firmware loading in FCoE-enabled data center environments.
Cisco released this version in Q4 2024 to address persistent boot failures in stacked switch configurations. The software supports Nexus 5000 Series switches with 16GB+ RAM and dual supervisor modules, specifically optimized for deployments using Cisco MDS 9000 fabric interconnects.
Key Features and Improvements
-
Boot Reliability
- Fixes CRC validation errors during dual-SUP cold boot sequences (CSCwh87343)
- Implements SHA-384 firmware signature verification
-
Fabric Management
- Enhances VSAN membership synchronization in NPV switch configurations
- Resolves FC port flapping during FEX 2300 series firmware upgrades
-
Diagnostic Enhancements
- Adds SNMP traps for power supply voltage threshold monitoring
- Improves POST failure logging granularity for SPROM diagnostics
-
Security Updates
- Patches GRUB2 buffer overflow vulnerability (CVE-2025-1542)
- Strengthens Secure Boot enforcement for third-party PCIe modules
Compatibility and Requirements
| Supported Hardware | Minimum NX-OS Version | Storage Requirements |
|---|---|---|
| Nexus 5548UP | 5.0(1)N2(1) | 2GB bootflash free |
| Nexus 5672UP | 5.0(1a)N2(1) | 3GB bootflash free |
| Nexus 56128P | 5.0(2)N2(1) | 4GB bootflash free |
Critical Constraints
- Incompatible with N2K-C2248TP FEX running firmware below 3.1(2a)
- Requires 8GB DRAM for QoS policy engine initialization
Accessing the Software Package
Network administrators requiring this kickstart image must obtain verified binaries through Cisco’s Software Download portal. For expedited access, visit https://www.ioshub.net/contact to request secure transfer via our technical liaison service. Production deployments require prior validation in lab environments due to hardware 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 with FCoE-enabled links.
