Download and Install the Softwareĭownload the Cumulus VX Qcow2 image for KVM. This section assumes you have Linux and KVM experience. The following procedure creates leaf01, leaf02, and spine01 and the network connections between them. These steps were tested with Cumulus VX 4.2, KVM/QEMU version 1:4.2-3ubuntu6.3, and Libvirt version 6.0.0 on Ubuntu Linux version 20.04. Create three VMs (leaf01, leaf02, and spine01) and the network connections between them.To facilitate additional configuration after the initial setup descibed in this guide, leaf01 and leaf02 also have two connections to each other.

leaf01 and leaf02 connect to spine01, which is the aggregation layer switch on the network. In the topology, leaf01 and leaf02 are the access layer switches on the network.

This section describes how to install and set up Cumulus VX with KVM/QEMU and Libvirt on a Linux server to create the two leaf and one spine topology shown below. It uses XML to represent and define the VM. libvirt provides an abstraction language to define and launch VMs, but is normally used just to launch single VMs.Because QEMU does not provide hardware acceleration, it works well with KVM. QEMU is a machine emulator that can allow the host machine to emulate the CPU architecture of the guest machine.KVM and QEMU are hypervisors that emulate the VMs the pair is often called KVM-QEMU or just KVM. KVM works exclusively with QEMU and performs hardware acceleration for x86 VMs with Intel and AMD CPUs.

Performing virtualization in Linux requires three components:

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