Nexus9300v.9.3.9.qcow2 [best] Jun 2026

"No bootable device" after conversion to VMDK.

At dawn I mounted it. The progress bar crawled like tide across an exposed reef, and then a console bloomed: lights, prompts, the terse punctuation of a network operating system waking. The boot sequence read like a poem to those who hear firmware as verse: PHY initializations like settling breath, ASIC microcode humming like distant engines, a kernel counting seconds into readiness. For a moment the machine and I existed in the same patient attention.

Enable KSM for better performance on systems with 32GB RAM or less: echo 1 > /sys/kernel/mm/ksm/run .

: Software-based forwarding caps data plane traffic to low bandwidth speeds, making it unsuitable for production environments.

: Create a dedicated directory inside the EVE-NG backend named exactly nexus9300v-9.3.9 . nexus9300v.9.3.9.qcow2

Connect to your EVE-NG server via SSH as the root user. Navigate to the QEMU directory and create a specific folder name for the Nexus image. The folder name must follow EVE-NG naming conventions (starting with nexus9300v- ). mkdir -p /opt/unetlab/addons/qemu/nexus9300v-9.3.9/ Use code with caution. Step 2: Upload the Image

This appears to be a Cisco Nexus 9300v virtual switch image file (QEMU Copy-On-Write format) for version 9.3.9.

Cisco’s official premier network simulation platform.

Which are you using (EVE-NG, GNS3, Proxmox, or VMware)? "No bootable device" after conversion to VMDK

During the boot sequence, connect via Telnet/SSH or VNC console using your lab software client. You will see GRUB boot menus, followed by Linux kernel initialization text, and eventually the standard Cisco Nexus setup dialog:

: Uses sequential mapping where the first vNIC provided by the hypervisor is assigned to the management interface, and subsequent vNICs map to Ethernet 1/1, 1/2, etc.. Management & Deployment Default Credentials : The default username is . There is typically no preconfigured password ; you are prompted to create one during the initial setup. Programmability : Supports automation through Boot Customization : Users can interrupt the boot process using

: A common issue on platforms like Proxmox is the VM dropping directly to a UEFI shell. The solution is to ensure the boot order is correct and that the virtual disk is attached via the IDE or SATA controller, not the default VirtIO or SCSI controller. The standard qcow2 image expects an emulated SATA or IDE disk interface.

The nexus9300v.9.3.9.qcow2 file is not a product; it is a tool. It sits in the sweet spot between the cripplingly slow later versions and the feature-poor older versions. The boot sequence read like a poem to

: On KVM, the default Linux bridge may block Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) traffic between VMs. You may need to adjust kernel parameters like group_fwd_mask on the Linux bridge to allow these protocols to function.

: Minimum of 4GB RAM for basic bootup, though 8GB to 12GB is recommended for full feature support (like BGP EVPN).

But what makes this specific version (9.3.9) so special? Why can’t you just download it from a random torrent site? And how do you actually optimize it for production-like testing?

Log into your EVE-NG server via SSH as the root user.

Enable the feature set needed for routing or data center topologies: