int vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address,
u8 is_specified, u32 user_instance);
int vnet_delete_loopback_interface (u32 sw_if_index);
+int vnet_create_sub_interface (u32 sw_if_index, u32 id,
+ u32 flags, u16 inner_vlan_id,
+ u16 outer_vlan_id, u32 * sub_sw_if_index);
int vnet_delete_sub_interface (u32 sw_if_index);
// Perform ethernet subinterface classification table lookups given