display interface loopback

Function

Using the display interface loopback command, you can view the status and traffic statistics of a loopback interface.

Format

display interface loopback [ loopback-number | main ]

Parameters

Parameter	Description	Value
loopback-number	Displays status and traffic statistics about a specified loopback interface. If loopback-number is not specified, the status and traffic statistics of all loopback interfaces are displayed.	-
main	Displays status and traffic statistics about a Loopback interface. A Loopback interface has no sub-interfaces. Status and traffic statistics about a Loopback interface are displayed whether you specify the main parameter or not.	-

Parameter

Description

Value

loopback-number

Displays status and traffic statistics about a specified loopback interface.

If loopback-number is not specified, the status and traffic statistics of all loopback interfaces are displayed.

main

Displays status and traffic statistics about a Loopback interface.

A Loopback interface has no sub-interfaces. Status and traffic statistics about a Loopback interface are displayed whether you specify the main parameter or not.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

In the scenario where you need to monitor the status of an interface or locate an interface fault, you can use the display interface loopback command to collect the statistics on the interface including the status. Through the displayed information, you can collect the traffic statistics and troubleshoot the interface.

Prerequisite

A loopback interface has been created using the interface loopback command.

Example

# Display the status and traffic statistics of a specified loopback interface.

<HUAWEI> display interface loopback 6

LoopBack6 current state : UP
Line protocol current state : UP (spoofing)
Description:
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 10.3.3.3/32
Current system time: 2012-02-25 09:56:04
    Last 10 seconds input rate 0 bits/sec, 0 packets/sec                                                                            
    Last 10 seconds output rate 0 bits/sec, 0 packets/sec                                                                           
    Realtime 0 seconds input rate 0 bits/sec, 0 packets/sec                                                                         
    Realtime 0 seconds output rate 0 bits/sec, 0 packets/sec                                                                        
    Input: 0 packets,0 bytes                                                                                                        
           0 unicast,0 broadcast,0 multicast                                                                                        
           0 errors,0 unknownprotocol                                                                                               
    Output:0 packets,0 bytes                                                                                                        
           0 unicast,0 broadcast,0 multicast                                                                                        
           0 errors                           
    Input bandwidth utilization  :    0%
    Output bandwidth utilization :    0%

**Table 1** Description of the **display interface loopback** command output
Item	Description
LoopBack6 current state	Physical status of a loopback interface. The physical status of a loopback interface is always Up after the loopback interface is created.
Line protocol current state	Link layer protocol status of a loopback interface. The link layer protocol status of a loopback interface is always Up after the loopback interface is created.
Description	Indicates the description of the interface, which can be set by using the description command.
Route Port,The Maximum Transmit Unit is 1500	Indicates the maximum transmission unit (MTU). The default MTU is 1500 bytes. Packets longer than the MTU are fragmented before being transmitted. If fragmentation is not allowed, the packet is discarded.
Internet Address is	Indicates the IP address of the interface.
Current system time	Indicates the current system time.
Input bandwidth utilization	Indicates the percentage of the rate for receiving packets to the total bandwidth.
Output bandwidth utilization	Indicates the percentage of the rate for sending packets to the total bandwidth.