display icmp statistics

Function

The display icmp statistics command displays ICMP packet statistics.

Format

display icmp statistics

display icmp statistics interface { interface-name | interface-type interface-num }

Parameters

Parameter	Description	Value
interface interface-type interface-num	Specifies the type and number of an interface. If this parameter is specified, ICMP packet statistics on the specified interface are displayed.	-

Parameter

Description

Value

interface interface-type interface-num

Specifies the type and number of an interface. If this parameter is specified, ICMP packet statistics on the specified interface are displayed.

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
ip-stack	read

Usage Guidelines

Usage Scenario

The Internet Control Message Protocol (ICMP) is an error-reporting mechanism and is used by IP or an upper-layer protocol (TCP or UDP). An ICMP packet is encapsulated as a part of an IP datagram and transmitted through the Internet.

When an error occurs during the IP datagram forwarding, ICMP reports the error to the source of the IP datagram, but does not rectify the error or notify the intermediate devices of the error.

To check statistics about ICMP packets, including sent and received ICMP error packets, echo request packets, and echo reply packets, run the display icmp statistics command.

During the ping or traceroute operations, for example, run the display icmp statistics command on the Router to check whether the number of sent and received packets is correct.

Precautions

Network attackers sometimes make use of ICMP packets to obtain network information for attacking the network. If the "destination unreachable", "redirects", "echo reply", and "time exceeded" field values displayed are large, check whether the device is being attacked.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display statistics about ICMP packets.

<HUAWEI> display icmp statistics
Input:  bad formats          0          bad checksum              0   
        echo                 0          destination unreachable   0   
        source quench        0          redirects                 0   
        echo reply           0          parameter problem         0   
        timestamp request    0          information request       0   
        mask requests        0          mask replies              0   
        time exceeded        0          timestamp reply           0   
        Mping request        0          Mping reply               0   
Output: echo                 0          destination unreachable   132360   
        source quench        0          redirects                 0   
        echo reply           0          parameter problem         0   
        timestamp request    0          information reply         0   
        mask requests        0          mask replies              0   
        time exceeded        0          timestamp reply           0
        Mping request        0          Mping reply               0

**Table 1** Description of the **display icmp statistics** command output
Item	Description
bad formats	Number of packets with incorrect formats.
bad checksum	Number of packets with incorrect checksums.
destination unreachable	Number of destination unreachable packets.
source quench	Number of source quench packets.
echo	Number of echo request packets.
echo reply	Number of echo reply packets.
parameter problem	Number of packets with incorrect parameters.
timestamp request	Number of timestamp request packets.
timestamp reply	Number of timestamp reply packets.
information request	Number of information request packets.
mask requests	Number of mask request packets.
mask replies	Number of mask reply packets.
time exceeded	Number of timeout packets.
Mping request	Number of multicast ping request packets.
Mping reply	Number of multicast ping reply packets.
redirects	Number of redirect packets.
Input	Received packet statistics.
Output	Sent packet statistics.