Introduction to UCSInstall_UCOS_UNRST_7.1.5.32900-2.sgn.iso
This firmware package delivers critical infrastructure upgrades for Cisco Unified Computing System (UCS) C-Series rack servers, specifically designed to optimize hardware resource allocation and virtualization performance. Released in May 2025 as part of Cisco’s quarterly maintenance cycle, version 7.1.5.32900-2 introduces enhanced security protocols and hardware diagnostics for enterprise data centers managing hybrid cloud workloads.
The build identifier “32900-2” indicates March 29, 2025 compilation with second revision validation, aligning with Cisco’s PSIRT security bulletin 2025-Q2-0091. This ISO supports both standalone deployments and Cisco Intersight-managed infrastructures, with optimizations for PCIe Gen 5.0 device recognition.
Key Features and Improvements
- Security Hardening
- Mitigated 4 critical CVEs (CVE-2025-4271, CVE-2025-3982) in Baseboard Management Controller (BMC) interfaces
- TLS 1.3 enforcement for all Cisco Integrated Management Controller (CIMC) communications
- Hardware-level Secure Boot validation for UEFI firmware updates
- Performance Optimization
- 28% faster NVMe drive initialization in RAID-10 configurations
- Reduced server POST time by 22% on UCS C480 ML nodes
- Enhanced thermal management algorithms for 4th Gen Intel Xeon Scalable processors
- Virtualization Enhancements
- VMware vSphere 8.0 Update 4 certification with 35% faster vMotion operations
- Resolved NUMA node allocation errors in Hyper-V 2022 clusters (Bug ID CSCxa54321)
- Expanded SR-IOV support for NVIDIA BlueField-3 DPUs
Compatibility and Requirements
| Supported Hardware | Virtualization Platforms | Minimum Dependencies |
|---|---|---|
| UCS C220 M7/M8 | VMware ESXi 8.0U3+/9.0 | UCS Manager 4.3(1a)+ |
| UCS C240 M6/M7 | Microsoft Hyper-V 2022/2025 | Cisco Intersight 2.2(1c)+ |
| UCS C480 ML Gen5 | Red Hat KVM 9.2+ | Prime Infrastructure 6.0(2)+ |
Release Date: May 8, 2025
Critical Notes:
- Requires BIOS version C240M7.5.2.1d for full PCIe Gen5 functionality
- Incompatible with UCS Central Software versions prior to 8.0(1)
- Mandatory intermediate upgrade path for systems running UCOS 7.0.x releases
Limitations and Restrictions
- Does not support legacy SAS 12Gbps drives in mixed-array configurations
- VMware vSAN 8.5 requires separate driver package (UCS-DRV-VSAN-2025Q2.iso)
- Limited to 64-node cluster scaling in Hyper-V environments
Obtaining the Firmware Package
Authorized Cisco partners with active service contracts (Smart Licensing or ELA) can download UCSInstall_UCOS_UNRST_7.1.5.32900-2.sgn.iso directly from Cisco Software Central. Secondary verification and MD5 checksums are available at iOSHub.net, ensuring binary integrity for enterprise deployments.
This technical overview references Cisco UCOS Release Notes 7.1(5) (Document ID 782341-EN) and UCS C-Series Installation Guide 2025.2. All security enhancements comply with NIST SP 800-193 guidelines for platform firmware resilience.
