Each physical interface can have multiple IP addresses assigned to it. If you want to have multiple networks on the same physical interface (called multinetting) but do not want to use 802.1Q VLANs, simply create multiple address configuration nodes directly under the primary interface.

To configure Ethernet multinetting, perform the following steps in configuration mode.

vyatta@R2# set interfaces dataplane dp0p1p1 address 172.16.0.65/24 

vyatta@R1# set interfaces dataplane dp0p1p1 address 192.168.1.17/24

vyatta@R1# commit
OK
[edit]
 
                            
                            

vyatta@R1# show interfaces dataplane dp0p1p1
 address 192.168.1.81/24
 address 
192.168.1.17/24