1Overview12Voyager Reference Guideis the number of the slot the device occupies in the unit.is the port number of the card. The first port on a NIC is port one. Forexample, a two-port Ethernet NIC in slot 2 is represented by two physicalinterfaces:eth-s2p1andeth-s2p2.The loopback interface also has a physical interface namedloop0.Use Voyager to set the attributes of the device. For example, line speed andduplex mode are attributes of an Ethernet physical interface. Eachcommunications port has exactly one physical interface.Configuring IP AddressesLogical interfaces are created for a device's physical interface. You assign anIP address to logical interfaces and then route to the IP address. Ethernet,FDDI, and Token Ring devices have one logical interface.For ATM devices, you create a new logical interface each time you configurean RFC1483 PVC for the device. Serial, T1/E1, and HSSI devices have onelogical interface when they are running PPP or Cisco HDLC. Serial, T1/E1and HSSI devices running point-to-point Frame Relay have a logical interfacefor each PVC configured on the port. You also have the option of configuringan unnumbered interface for point-to-point interfaces. Tunnels, however,cannot be configured as unnumbered interfaces.Logical interfaces, by default, are named after the physical interface for whichthey are created. If you wish, you can override this default name with a moredescriptive or familiar name. You can also associate a comment with thelogical interface as a further way to define its relationship in the network.Default logical interface names have the form:-spcwhere,andhave the same values as the correspondingphysical interfaceis the channel number of the logical interface. For logical interfacescreated automatically, the channel number is always zero. For logical
