external network traffic between to vms on the same host

Hi

My question is regarding external network traffic between to vms on the same host.

VM “A” is located on “host1” with an external virtual switch “VLAN100”

VM “B” is also located on “host1” with the same external switch “VLAN100”

VM “A” and “B” generate heavy network traffic between them, but must be on an external network to communicate with other servers.

Will network traffic between “A” and “B” be “host internal” (filtered by the Hyper-V host) or will network traffic between the vms be go through the physical network switch which the host is attached to?

Is there any benefits regarding to network traffic if VM “A” and “B” are on the same Hyper-V host?

Thanks!

Kristian