Introduction VMware ESXi is a type-1 hypervisor widely used for server virtualization. Hardware vendors such as Cisco supply customized ESXi ISOs that package VMware’s base ESXi image with vendor-specific drivers, utilities, and management agents optimized for their server platforms (e.g., Cisco UCS and Cisco UCS C-Series). These customized ISOs simplify deployments, ensure driver/firmware compatibility, and can include integrations like Cisco’s Unified Computing Manager (UCM)/Intersight agents, CIM providers, or proprietary network/storage drivers.
Why Cisco provides customized ESXi ISOs
What’s typically included in a Cisco customized ISO
Choosing the right ISO
Where to obtain Cisco customized ESXi ISOs
Download considerations and best practices
How Cisco-customized ISOs differ from vanilla VMware ISOs
Creating or customizing your own Cisco-compatible ISO
Legal and licensing notes
Practical deployment workflow (concise)
Risks and mitigation
Conclusion Using Cisco-customized ESXi ISOs is a best practice for deployments on Cisco server platforms when you want validated driver/firmware compatibility, integrated management, and smoother vendor support. Administrators should always confirm ESXi/build compatibility, verify checksums, align firmware versions, and test images before production deployment. Keep careful documentation and follow Cisco’s and VMware’s guidance for updates and lifecycle management.
To download the VMware ESXi Cisco Custom ISO , you must now Broadcom Support Portal
, as Broadcom has centralized all VMware downloads following its acquisition. These custom images are specifically optimized with validated Cisco UCS drivers for network (enic) and storage (fnic) controllers. Broadcom Community 1. Official Download Guide (Broadcom Portal)
Accessing custom ISOs requires a valid active VMware subscription. Cisco Community : Navigate to the Broadcom Support Portal and sign in with your enterprise credentials. Navigate to Downloads "My Downloads" from the left-hand sidebar. Search for "VMware vSphere" in the product search bar. Select Version : Choose your major version (e.g., vSphere 8.0 Access Custom ISOs Locate the "Custom ISOs" tab at the top of the product listing. Expand the list to find the "Cisco Custom Image for ESXi" : Select the latest release (e.g., Cisco-UCS-Addon-ESXi 4.3.x
) and accept the terms and conditions to begin the download. Broadcom Community 2. Why Use the Cisco Custom ISO? Cisco custom ESXi Images | VMware vSphere
To download the Cisco Custom VMware ESXi ISO, you must access the Broadcom Support Portal following Broadcom's acquisition of VMware. These custom images are specifically pre-configured with the necessary drivers (such as the Cisco VIC Ethernet driver) required for proper installation and operation on Cisco UCS hardware. How to Download the Cisco Custom ISO
The standard download location has shifted from the old VMware site to the Broadcom portal.
Log in to the Broadcom Support Portal with a registered account. Navigate to My Downloads > VMware vSphere.
Select your desired major version (e.g., vSphere 8.0 or 7.0).
At the top of the version selection page, click on the Custom ISOs tab.
Locate the Cisco Custom Image for ESXi for your specific release (e.g., 8.0 Update 3) and click Go To Downloads. Creating a Custom ISO Manually vmware esxi cisco custom iso top download
If a specific pre-built ISO is unavailable or you need to include newer drivers, you can build your own using the vSphere Lifecycle Manager (vLCM) within vCenter:
Import Drivers: Download the latest driver zip files from Cisco Product Support and import them into the vLCM Software Depot.
Define Image: Create a new cluster image, selecting the base ESXi version and adding specific Cisco components like the Cisco VIC Ethernet Driver.
Export: Use the Export option in vLCM to generate a bootable ISO file. Key Considerations Installing VMware ESXi 9 with the Latest Cisco Drivers
The Cisco Custom ISO for VMware ESXi is a specialized installer image designed specifically for Cisco Unified Computing System (UCS) hardware. Unlike the standard VMware image, these custom ISOs come pre-bundled with the latest Cisco-validated drivers (such as enic for Ethernet and fnic for Fiber Channel) to ensure the installer can actually detect and interact with UCS-specific network and storage adapters during the initial setup. Where to Download
Since Broadcom's acquisition of VMware, the download process has moved to the Broadcom Support Portal.
Solved: VMware ESXi 7.0U3g - OEM Custom ISO? - Cisco Community
VMware ESXi Cisco Custom ISO: A Comprehensive Guide to Top Downloads
As a virtualization administrator or a network engineer, you're likely no stranger to VMware ESXi and Cisco's robust networking solutions. When it comes to integrating these two technologies, a custom ISO can be a game-changer. In this article, we'll explore the world of VMware ESXi Cisco custom ISOs, their benefits, and provide a step-by-step guide on how to obtain and use them. We'll also highlight some of the top download sources for these custom ISOs.
What is a VMware ESXi Cisco Custom ISO?
A custom ISO is a modified version of the standard VMware ESXi installation media, which includes additional drivers, software, or configurations specific to a particular hardware platform or vendor. In the case of a Cisco custom ISO, it's designed to support Cisco's server hardware, such as their UCS (Unified Computing System) servers.
These custom ISOs typically include:
Benefits of Using a VMware ESXi Cisco Custom ISO
Using a Cisco custom ISO can bring several benefits to your virtualization environment:
Obtaining a VMware ESXi Cisco Custom ISO
There are several sources where you can download a VMware ESXi Cisco custom ISO:
Top Download Sources for VMware ESXi Cisco Custom ISOs
Here are some popular sources for downloading VMware ESXi Cisco custom ISOs:
Step-by-Step Guide to Creating a VMware ESXi Cisco Custom ISO
If you're unable to find a pre-made custom ISO, you can create one using the following steps:
mkisofs or genisoimage to create a new ISO image from the custom ISO directory.Conclusion
A VMware ESXi Cisco custom ISO can significantly simplify the deployment and management of your virtualization environment, especially when working with Cisco's server hardware. By understanding the benefits and creation process of custom ISOs, you can unlock advanced features, improve compatibility, and enhance performance.
When searching for a top download source, be sure to explore official channels, such as Cisco's website, VMware's Partner Central, and VMware's ESXi custom ISO page. If you're unable to find a pre-made custom ISO, follow the step-by-step guide to create your own.
FAQs
By following this comprehensive guide, you'll be well on your way to leveraging the power of VMware ESXi Cisco custom ISOs in your virtualization environment.
To download the Cisco Custom ISO for VMware ESXi, you must use the Broadcom Support Portal, as Broadcom now hosts all VMware downloads following its acquisition of the company. How to Download from Broadcom
Log In: Access the Broadcom Support Portal with your registered personal or company account.
Navigate to Downloads: Click on My Downloads in the left-hand menu.
Find vSphere: Search for "VMware vSphere" and select the product corresponding to your entitlement (e.g., VMware vSphere Enterprise Plus).
Select Version: Choose your desired major version, such as 8.0 or 7.0.
Access Custom ISOs: Look for the Custom ISOs tab at the top of the version list.
Download Cisco Image: Locate the Cisco Custom Image for ESXi in the list and click the download icon. Alternative: Create a Custom ISO
If you need specific drivers (like the latest VIC Ethernet drivers) or are using ESXi 9.0+, you can build your own image using the vSphere Lifecycle Manager (vLCM):
Import Drivers: Download the required driver ZIP files from the Cisco Support Site and import them into the vSphere Lifecycle Manager.
Build Image: Create a new cluster image, select the base ESXi version, add the Cisco drivers as Independent Components, and then use the Export option to generate a bootable ISO. Key Links for Cisco UCS Users
The Cisco Custom ISO for VMware ESXi is a hardware-specific installation image designed to ensure seamless compatibility between VMware vSphere and Cisco Unified Computing System (UCS) hardware. Quick Review: Why Use a Cisco Custom ISO?
Driver Integration: It includes the latest Cisco-certified drivers (e.g., VIC Ethernet and Storage drivers like enic and fnic) that are not present in the standard VMware base image.
Stability: Using the custom ISO prevents installation failures on UCS hardware and minimizes peripheral issues after deployment.
Simplified Management: It aligns the hypervisor with Cisco UCS firmware, allowing for better monitoring and control through tools like the Cisco UCS Manager Plug-in. Top Download Locations (As of April 2026)
The download process has changed following Broadcom's acquisition of VMware. Primary Download Source ESXi 8.0 & Older Broadcom Support Portal
Found under the "Custom ISOs" tab within the vSphere download section. ESXi 9.0 & Newer Cisco Software Central
Broadcom no longer hosts these; they must be sourced directly from Cisco or Cisco Intersight. How to Download from Broadcom (ESXi 8.x and below) Log in to the Broadcom Support Portal. Navigate to My Downloads > VMware vSphere. Select your major version (e.g., 8.0). Click on the Custom ISOs tab at the top of the list. VMware ESXi and Cisco Customized ISOs — Detailed
Locate the entry for Cisco Custom Image for ESXi and click the download icon. Manual Image Creation (Best Practice for ESXi 9.0+)
Cisco now recommends using vSphere Lifecycle Manager (vLCM) to build your own custom image by combining the VMware base image with the latest Cisco Add-on drivers.
Step 1: Download the latest Cisco Add-on drivers from Cisco Product Support. Step 2: Import these drivers into the vLCM Software Depot.
Step 3: Create a new cluster image in vCenter, add the Cisco components, and Export it as a bootable ISO.
Are you planning to perform a fresh installation or an in-place upgrade of your existing UCS environment?
This is a specific enterprise infrastructure query. You are looking for the top (most downloaded/stable/recommended) VMware ESXi Cisco Custom ISO—not the generic VMware ISO.
Here is the deep-feature breakdown of what you are actually looking for and why it matters.
Let’s walk through the most common method—using the Cisco Software Download portal.
Prerequisites:
Steps:
software.cisco.com/download.VMware-ESXi-8.0U3-custom-Cisco-8.0.3-a.iso (Numbers will vary).certutil -hashfile <file.iso> SHA256 (Windows) or shasum -a 256 <file.iso> (Linux) and match it to Cisco’s published checksum.Using the wrong custom ISO can brick your host installation. Use this compatibility matrix:
| Cisco UCS Server Generation | Recommended ESXi Custom ISO | Minimum Firmware Version | |-----------------------------|-----------------------------|---------------------------| | M7 (e.g., B200 M7) | ESXi 8.0 Update 2 or newer | 4.2(3) | | M6 (e.g., C220 M6) | ESXi 7.0 Update 3o | 4.1(3b) | | M5 (e.g., B200 M5) | ESXi 7.0 Update 3c – 3o | 4.0(4a) | | M4 (legacy) | ESXi 6.7 Update 3 | 3.2(3c) |
Pro tip: Before downloading, run the Cisco UCS Hardware Compatibility List (HCL) tool to verify your exact server model + ESXi version.
Do not use third-party sites. The official Cisco pathway is:
-Custom-Cisco- and the VMware build number (e.g., build-24280778). The highest build number = most patched.Finding a legitimate, malware-free ISO is critical. Below are the only four official sources you should use. Avoid random torrent sites or third-party file lockers.
Even experienced admins make mistakes. Here are the top errors and how to avoid them:
| Mistake | Consequence | Solution |
|---------|-------------|----------|
| Downloading “Cisco Custom” for the wrong server generation | NICs not detected during install | Check server model in IMC before download |
| Using the latest ISO without checking firmware compatibility | PSOD (Purple Screen of Death) on boot | Align firmware to recommended version per Cisco HCL |
| Downloading from a file-sharing site (e.g., random Google Drive) | Backdoored hypervisor | Only use software.cisco.com |
| Using a generic VMware ISO on UCS | No hardware health sensors in vCenter | Reinstall with correct Cisco ISO (no upgrade path) |
Because Broadcom restricted generic downloads, the actual top downloaded file has shifted. The most common search leading to the correct file is:
"Cisco UCS Host Upgrade Utility ISO"
Deep reason: The "Host Upgrade Utility" contains the same custom ESXi ISO plus the Cisco tools to upgrade firmware in one bootable image. This is the file 80% of admins actually download.
.iso.checksum file and verify the SHA256 hash.Before deploying, verify the VMware build number against Broadcom’s security advisories (VMSA). In 2025-2026, the top ISO must include patches for: Hardware compatibility: Integrates NIC, HBA, RAID, and other
If the Cisco ISO is older than 3 months, do not use it as "top" – manually patch after install.