resources/templates/vat/l2_xconnect.vat

   1 sw_interface_set_flags sw_if_index {interface1} admin-up link-up
   2 sw_interface_set_flags sw_if_index {interface2} admin-up link-up
   3 sw_interface_set_l2_xconnect rx_sw_if_index {interface1} tx_sw_if_index {interface2}