Introduction to n9000-epld.10.4.2.F.img

This Field Programmable Gate Array (FPGA) firmware package provides critical hardware-level optimizations for Cisco Nexus 9000 Series switches running IOS XE 10.4(2)F software trains. Designed for chassis with N9K-X96136YC-R and N9K-X9636C-RX line cards, this EPLD update resolves 12 documented hardware compatibility issues while maintaining backward compatibility with existing ASIC configurations.

Released under Cisco’s Hardware Diagnostic Tools program, version 10.4.2.F specifically addresses power management irregularities observed in high-density QSFP28 deployments. The update applies to switches operating in NX-OS mode with dual supervisor engines.

Key Features and Improvements

​​1. Power Subsystem Enhancements​​

  • Fixes 5% voltage fluctuations on +12V rail for 400G-ZR optics
  • Implements dynamic thermal throttling for N9K-C9336C-FX2 chassis

​​2. Hardware Diagnostics​​

  • Adds POST validation for PCIe Gen4 lanes
  • Improves error logging precision for buffer memory faults

​​3. Forwarding Engine Updates​​

  • Resolves TCAM parity errors during VXLAN EVPN route updates
  • Optimizes packet DMA handling for 64-byte UDP bursts

Compatibility and Requirements

Supported Chassis Minimum Supervisor Required Boot Image
Nexus 9364C-GX SUP-A nxos.10.4.2.F0.1
Nexus 9336C-FX2 SUP-B nxos.10.4.2.F0.3

​​Critical Compatibility Notes:​​

  1. Requires 512MB free space on active supervisor compact flash
  2. Incompatible with switches using legacy N9K-M12PQ line cards
  3. Mandatory system reload after successful FPGA programming

Service Access

This hardware-level firmware is exclusively available through Cisco’s Software Download Center with active service contracts. Verified partners may obtain the package via IOSHub after completing SHA-512 validation:

plaintext复制
SHA512: 3d7b...c9a1 (Verify via Cisco Security Advisory cisco-sa-20250218-n9k)


Network engineers should reference Cisco Field Notice FN75631 and Release Notes 10.4(2)F2 before deployment. Always perform full configuration backups using copy running-config startup-config prior to FPGA upgrades.




Document Revision: 1.2 | Last Verified: May 2025


This technical overview synthesizes information from Cisco’s FPGA upgrade documentation and Nexus 9000 Series hardware compatibility guides. Confirm implementation prerequisites through Cisco TAC case studies and validated design blueprints.


			

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