On 09/16/2015 03:18 PM, C.L. Martinez wrote: > Thanks Dmitry... Uhmm, but my case is: "b) you provide more then one > network interface to the virtual machine". I have several kvm guests > with 3 or more network interfaces ... In this case, do you recommends to > enable STP?? If you are the one who manages the VM's and you're not masochistic to intentionally bridge vNICs inside some VM, you don't need it.