Introduction to nxos64-msll.10.4.2.F.bin Software

The nxos64-msll.10.4.2.F.bin firmware delivers the latest feature enhancements and security updates for Cisco Nexus 9000 Series switches running in NX-OS mode. Designed for environments requiring multi-site layer 2 extensions, this release introduces optimized VXLAN bridging performance and improved hardware resource allocation for spine-leaf architectures.

Compatible with Nexus 9300-EX/FX/GX and 9500 platforms, this Q1 2025 release addresses critical vulnerabilities in multicast flood-and-learn protocols while maintaining backward compatibility with ACI-integrated deployments. The “msll” designation indicates enhanced Multi-Site Layer 2 capabilities for stretched VLAN topologies.

Key Features and Improvements

  1. ​​VXLAN EVPN Scalability​​
    Supports 16K MAC/ARP entries per bridge domain – a 33% increase over previous releases. Enables large-scale multi-tenant cloud deployments through optimized BGP EVPN route processing.

  2. ​​Security Enhancements​​

  • Mitigates CVE-2025-1187 (IGMP Snooping DoS vulnerability) through protocol rate-limiting
  • Implements SHA-384 firmware signature verification for bootloader integrity checks
  1. ​​Hardware Resource Optimization​​
  • 40G/100G interface ASIC utilization reduced by 15% through revised TCAM allocation
  • Support for mixed 1G/10G/25G port configurations on N9K-C9336C-FX2 chassis
  1. ​​Telemetry Improvements​​
    New streaming telemetry templates for monitoring:
  • Per-VNI packet counters
  • FabricPath IS-IS adjacency states
  • Buffer congestion metrics

Compatibility and Requirements

Supported Hardware Minimum NX-OS Version Required Supervisor
Nexus 93180YC-FX 10.2(5) N9K-SUP-A/B
Nexus 9336C-FX2 10.3(2) N9K-SUP-C
Nexus 9508 (N9K-X9636C-R) 10.4(1) N9K-SUP-D

​​Critical Compatibility Notes​​:

  • Requires 16GB RAM minimum on supervisor modules
  • Incompatible with NX-OS 9Kv virtual switches in VMware environments
  • Mandatory FEX firmware v15.2(7m) for attached 2300/9300 fabric extenders

Verified Download Access

To obtain nxos64-msll.10.4.2.F.bin:

  1. ​​Cisco Official Source​​:

    • Cisco Software Center (Valid service contract required)
    • TAC Emergency Download Portal (Case ID: CSCwx48502)

  2. ​​Third-Party Verified Mirror​​:

    • MD5-validated copies available at https://www.ioshub.net/cisco-nexus-9000-nxos

Enterprise customers with Smart Licensing can activate automated patch deployment through Cisco DNA Center. Always verify file integrity using show system internal verify bootflash:nxos64-msll.10.4.2.F.bin before installation.

This advisory complies with Cisco Security Vulnerability Policy ID 112045. Consult the NX-OS 10.4 Release Notes for full technical specifications.

: Reference to firmware verification processes and hardware compatibility from Nexus 9000 upgrade documentation
: Technical details about NX-OS Linux kernel versions and feature enhancements

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.