OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Loopback interfaces

A loopback interface is a virtual interface in which the software emulates an interface. Because a loopback interface is not associated to physical hardware entities, the loopback interface status is not affected by hardware status changes.

Packets routed to a loopback interface are processed locally to the OS10 device. Because this interface is not a physical interface, you can configure routing protocols on this interface to provide protocol stability. You can place loopback interfaces in default L3 mode.

  • Enter the loopback interface number in CONFIGURATION mode (0 to 16383).
    interface loopback 
                                           number
                                        
  • Enter the loopback interface number to view the configuration in EXEC mode.
    show interface loopback 
                                           number
                                        
  • Enter the loopback interface number to delete a loopback interface in CONFIGURATION mode.
    no interface loopback 
                                           number
                                        
View loopback interface
OS10# show interface loopback 4
                                    Loopback 4 is up, line protocol is up
                                    Hardware is unknown.
                                    Interface index is 102863300
                                    Internet address is 120.120.120.120/24
                                    Mode of IPv4 Address Assignment : MANUAL
                                    MTU 1532 bytes
                                    Flowcontrol rx false tx false
                                    ARP type: ARPA, ARP Timeout: 240
                                    Last clearing of "show interface" counters : 00:00:11
                                    Queuing strategy : fifo
                                    Input 0 packets, 0 bytes, 0 multicast
                                    Received 0 errors, 0 discarded
                                    Output 0 packets, 0 bytes, 0 multicast
                                    Output 0 errors, Output 0 invalid protocol
                                    Time since last interface status change : 00:00:11
                                 

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