530 CHAPTER 28: L OGICAL INTERFACE CONFIGURATION■ X.25 address mapping different from that of the WAN interface (also known asthe primary interface)■ IP addresses in a network segment different from the network segment thatthe WAN interface resides■ IPX network numbers and IPX operation parameters different from those of theWAN interface■ Virtual circuits corresponding to a sub-interfaceFor the detailed configuration information, refer to “X.25 and LAPBConfiguration” on page 283 and “IPX Configuration” on page 2217.Create an ATM sub-interface1 Create an ATM sub-interface2 Configure relevant operation parametersOn ATM sub-interfaces, you can configure:■ IP addresses in a network segment different from the network segment thatthe WAN interface resides■ Virtual circuits corresponding to a sub-interfaceFor the detailed configuration information, refer to “ATM and DSL InterfaceConfiguration” on page 71.Ethernet Sub-interfaceConfiguration ExampleNetwork requirementsAs shown in Figure 148, the encapsulation type for the VLAN ports of Switch 1and Switch 2 is dot1q, workstation A and C belong to VLAN 10, and workstationB and D belong to VLAN 20. It is required that:■ The IP addresses of router subinterfaces Ethernet 3/0.10, Ethernet 3/0.20,Ethernet 4/0.10, and Ethernet 4/0.20 are 1.0.0.1/8, 2.0.0.1/8, 3.0.0.1/8, and4.0.0.1/8.■ Work station A can intercommunicate with work station B, and work station Ccan intercommunicate with work station D, that is, devices connected to thesame switch but belonging to different VLANs can intercommunicate with eachother.■ Work station A can intercommunicate with work station C, and work station Bcan intercommunicate with work station D, that is, devices connected toTable 27 Create an ATM sub-interfaceOperation Command DescriptionEnter system view system-view -Create an ATMsub-interface and enterthe ATM sub-interfaceviewinterface atminterface-number.subnumber [ p2mp |p2p ]RequiredIf the specified ATM sub-interface does notexist, this command first creates thesub-interface and then enters thesub-interface view.By default, point-to-multipointsub-interfaces are created.
