display interface null

Function

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

Format

display interface null [ 0 | main ]

Parameters

Parameter	Description	Value
0	Displays status and traffic statistics about a specified Null interface.	The value can be 0 only.
main	Displays status and traffic statistics about a Null interface. A Null interface has no sub-interfaces. Status and traffic statistics about a Null interface are displayed whether you specify the main parameter or not.	-

Parameter

Description

Value

Displays status and traffic statistics about a specified Null interface.

The value can be 0 only.

main

Displays status and traffic statistics about a Null interface.

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

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

The display interface null command displays the status of a null interface. The interface status information includes: the physical status, link layer protocol status, description, MTU, IP address, current system time, last time statistics about the null interface are cleared, incoming and outgoing packet rates in bit/s and pps, total numbers of packets and bytes received and sent by the null interface, and percentages of the rates for receiving and sending packets to the total bandwidth.

Precautions

There is only one null interface, namely, NULL 0.

Example

# Display the status and traffic statistics of Null 0 interface.

<HUAWEI> display interface null 0

NULL0 current state : UP
Line protocol current state : UP (spoofing)
Description:
Route Port,The Maximum Transmit Unit is 1500
Internet protocol processing : disabled
Physical is NULL DEV
Current system time: 2012-02-25 10:25:59
    Last 300 seconds input rate 0 bits/sec, 0 packets/sec
    Last 300 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 null command output
Item	Description
NULL0 current state	Indicates the physical status of the null interface. The physical status of the null interface is always Up.
Line protocol current state	Indicates the link layer protocol status of the interface. The protocol status of the null interface is always Up.
Description	Indicates the description of the interface, which can be set by using the description command.
Route Port	A Layer 3 interface.
The Maximum Transmit Unit	Indicates the MTU of the interface.
Internet protocol processing : disabled	Indicates that the Internet protocol processing is not configured.
Physical is NULL DEV	Indicates that the interface is null.
Current system time	Indicates the current system time.
Last 300 seconds input rate Last 300 seconds output rate	Indicates the rates for sending and receiving the bytes and the packets by the interface in the last five minutes.
Realtime 0 seconds input rate Realtime 0 seconds output rate	Indicates the real-time rates of sending and receiving the bytes and the packets. It refers to the interval between two display commands that are run on the same interface. The maximum value is the statistical interval displayed in the previous piece of information. This entry is displayed only when information about a logical interface is viewed.
Input	Indicates the total number of packets and the total number of bytes received by the interface.
Output	Indicates the total number of packets and the total number of bytes sent by the interface.
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.