8.8.

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  name: vm-fedora
template:
  spec:
    domain:
      devices:
        interfaces:
        - name: defaultnetwork
          masquerade: {}
        # new interface
        - name: <secondary_nic> 

          bridge: {}
    networks:
    - name: defaultnetwork
      pod: {}
    # new network
    - name: <secondary_nic> 

      multus:
        networkName: <nad_name> 

# ...

NAME                        PHASE             VMI
kubevirt-migrate-vm-lj62q   Scheduling        vm-fedora
kubevirt-migrate-vm-lj62q   Scheduled         vm-fedora
kubevirt-migrate-vm-lj62q   PreparingTarget   vm-fedora
kubevirt-migrate-vm-lj62q   TargetReady       vm-fedora
kubevirt-migrate-vm-lj62q   Running           vm-fedora
kubevirt-migrate-vm-lj62q   Succeeded         vm-fedora

[
  {
    "infoSource": "domain, guest-agent",
    "interfaceName": "eth0",
    "ipAddress": "10.130.0.195",
    "ipAddresses": [
      "10.130.0.195",
      "fd02:0:0:3::43c"
    ],
    "mac": "52:54:00:0e:ab:25",
    "name": "default",
    "queueCount": 1
  },
  {
    "infoSource": "domain, guest-agent, multus-status",
    "interfaceName": "eth1",
    "mac": "02:d8:b8:00:00:2a",
    "name": "bridge-interface", 

    "queueCount": 1
  }
]

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  name: vm-fedora
template:
  spec:
    domain:
      devices:
        interfaces:
          - name: defaultnetwork
            masquerade: {}
          # set the interface state to absent
          - name: <secondary_nic>
            state: absent 

            bridge: {}
    networks:
      - name: defaultnetwork
        pod: {}
      - name: <secondary_nic>
        multus:
          networkName: <nad_name>
# ...