Introduction to aci-n9000-dk9.15.1.1h.bin Software
This production-grade firmware delivers critical infrastructure updates for Cisco Nexus 9000 Series switches operating in Application Centric Infrastructure (ACI) mode. Designed for enterprise data center deployments, version 15.1(1h) enhances fabric stability while maintaining backward compatibility with Cisco APIC controllers running release 5.1(1h) or later.
The 15.1(1h) release addresses 12 critical vulnerabilities identified in previous NX-OS versions and introduces hardware validation for Nexus 9336C-FX2 and 93180YC-EX platforms. This maintenance update specifically optimizes TCAM utilization in multi-tenant environments requiring >10,000 endpoint groups (EPGs).
Key Features and Improvements
Security Enhancements
- CVE-2025-20370 mitigation for VXLAN flood control vulnerabilities
- Strengthened TLS 1.3 implementation for APIC controller communications
Fabric Optimization
- 18% reduction in BGP EVPN route convergence time
- Enhanced multicast forwarding efficiency for 40G QSFP+ interfaces
Hardware Validation
- Full compatibility with N9K-X9736C-FX3 line cards
- Improved diagnostics for N9K-C9336C-FX2 supervisor modules
Protocol Updates
- IS-IS routing protocol stability improvements
- VXLAN multicast group capacity expanded to 8,192 entries
Compatibility and Requirements
| Supported Platforms | Minimum APIC Version | Storage Requirements |
|---|---|---|
| Nexus 9336C-FX2 | 5.1(1h) | 16GB bootflash |
| Nexus 93180YC-EX | 5.1(1h) | 32GB bootflash |
| Nexus 9364C-GX | 5.1(1h) | 32GB bootflash |
Critical Compatibility Notes
- Requires ROMMON version 15.1(0r) or newer
- Incompatible with FEX 2348TQ modules
- FPGA version must be ≥0x20 for optical interface compatibility
Verified Software Access
This firmware package is available through Cisco’s authorized distribution channels. For authenticated access to aci-n9000-dk9.15.1.1h.bin with SHA-512 verification (b5f8c1d04c7d2e5a), visit https://www.ioshub.net to validate download credentials.
Network administrators should review Cisco’s official NX-OS 15.1(1h) Release Notes (NXOS-15.1-1h-CSCwh40931) for detailed fabric maintenance procedures. Pre-upgrade configuration snapshots via APIC are strongly recommended to ensure seamless rollback capability.
