VLAN InterfacesVLANs are logical interfaces and are, by default, in Layer 2 mode. Physical interfaces and port channelscan be members of VLANs.For more information about VLANs and Layer 2, see Layer 2 and Virtual LANs (VLANs).NOTE: To monitor VLAN interfaces, use Management Information Base for Network Management ofTCP/IP-based internets: MIB-II (RFC 1213).NOTE: You cannot simultaneously use egress rate shaping and ingress rate policing on the sameVLAN.Dell Networking OS supports Inter-VLAN routing (Layer 3 routing in VLANs). You can add IP addresses toVLANs and use them in routing protocols in the same manner that physical interfaces are used. For moreinformation about configuring different routing protocols, refer to the chapters on the specific protocol.A consideration for including VLANs in routing protocols is that you must configure the no shutdowncommand. (For routing traffic to flow, you must enable the VLAN.)NOTE: You cannot assign an IP address to the default VLAN, which is VLAN 1 (by default). To assignanother VLAN ID to the default VLAN, use the default vlan-id vlan-id command.To assign an IP address to an interface, use the following command.• Configure an IP address and mask on the interface.INTERFACE modeip address ip-address mask [secondary]– ip-address mask: enter an address in dotted-decimal format (A.B.C.D). The mask must be inslash format (/24).– secondary: the IP address is the interface’s backup IP address. You can configure up to eightsecondary IP addresses.Example of a Configuration for a VLAN Participating in an OSPF Processinterface Vlan 10ip address 1.1.1.2/24tagged TenGigabitEthernet 2/2/1-2/4/4tagged TenGigabitEthernet 5/1/1ip ospf authentication-key force10ip ospf cost 1ip ospf dead-interval 60ip ospf hello-interval 15no shutdown!Loopback InterfacesA Loopback interface is a virtual interface in which the software emulates an interface. Packets routed toit are processed locally.Because this interface is not a physical interface, you can configure routing protocols on this interface toprovide protocol stability. You can place Loopback interfaces in default Layer 3 mode.To configure, view, or delete a Loopback interface, use the following commands.Interfaces 387
