Criando interfarce bridge

nmcli connection show

nmcli connection  add type bridge ifname vms-br1 autoconnect yes

nmcli connection add type bridge-slave  ifname ens3  master  bridge-vms-br1 autoconnect yes

nmcli connection show

nmcli connection down "Wired connection 1"

nmcli connection up   "bridge-vms-br1"

Definindo interface Bridge no Virsh para Virt-Manager

nano config-vms-br1.xml

<network>
    <name>vms-br1</name>
    <forward mode="bridge" />
    <bridge  name="vms-br1" />
</network>

virsh  net-define config-vms-br1.xml 

virsh  net-start vms-br1

virsh net-autostart vms-br1 

virsh net-list --all

Removendo interfaces criadas

Caso queira remover as interfaces criadas faça o seguinte procedimento;

virsh net-destroy vms-br1

virsh net-undefine  vms-br1

nmcli connection delete bridge-vms-br1 bridge-slave-ens3

nmcli connection up "Wired connection 1"