When installing contrail, you can choose to have one single interface for data/control/management or separate the management and data/control traffic between multiple interfaces. From Contrail 2.X and higher, data/control cannot be on separate interfaces. For example, they must use the same physical interface or bond interface. Management traffic can be on a separate physical interface.
How to identify physical interfaces used for data/control traffic on a compute node
Use the following command to find the physical interface or interfaces on the compute host used for data/control traffic:
#less /etc/contrail/contrail-vrouter-agent.conf | grep phy physical_interface_address= physical_interface_mac=94:57:a5:5a:cf:6d vmware_physical_interface= physical_interface= em2
In the output above, em2 interface on the compute host is used for data/control traffic.