If using traffic scripts in test add "| Suite Setup | Setup all TGs before traffic script" to test suite robot file, this bind TG interfaces to the kernel driver specified in topology. Also add kernel driver name for TG interfaces to topology YAML file. You can find driver name with following command where you specify interface PCI address: # lspci -vmmks 0000:00:07.0 Slot: 00:07.0 Class: Ethernet controller Vendor: Red Hat, Inc Device: Virtio network device SVendor: Red Hat, Inc SDevice: Device 0001 PhySlot: 7 Driver: virtio-pci