display mld invalid-packet

Function

The display mld invalid-packet command displays statistics about invalid Multicast Listener Discovery (MLD) messages received by a device.

Format

display mld invalid-packet [ interface { interface-type interface-number | interface-name } | message-type { query | report | done } ] ^*

display mld { vpn-instance vpn-instance-name | all-instance } invalid-packet [ interface { interface-type interface-number | interface-name } | message-type { query | report | done } ] ^*

Parameters

Parameter	Description	Value
interface interface-type interface-number	Displays statistics about invalid MLD messages received by a specified interface. interface-type interface-number specifies the interface type and interface number.	-
message-type	Displays statistics about invalid MLD messages of a specific type.	-
query	Displays statistics about invalid Query messages.	-
report	Displays statistics about invalid Report messages.	-
done	Displays statistics about invalid Done messages.	-
vpn-instance vpn-instance-name	Specifies the name of a VPN instance.	The value is a string of 1 to 31 case-sensitive characters, spaces not supported. In addition, the VPN instance name must not be _public_. When double quotation marks are used around the string, spaces are allowed in the string.
all-instance	Specifies all VPN instance.	-

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
igmp	read

Usage Guidelines

Usage Scenario

You can run the display mld invalid-packet command to view statistics of invalid MLD messages for fault location and rectification.

If MLD entries fail to be generated on a multicast network, you can run the display mld invalid-packet command first to check whether devices have received invalid MLD messages.

You can run the following related commands to view information about specific invalid MLD messages:

Run the display mld invalid-packet command to view statistics about invalid MLD messages received by a device.
Run the display mld invalid-packet interface command to view statistics about invalid MLD messages received by a specified interface.

Example

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

# Display statistics about invalid MLD messages received by a device in the public network instance.

<HUAWEI> display mld invalid-packet
         Statistics of invalid packets for public net:                      
- -------------------------------------------------------------------
MLD Query invalid packet:
Unwanted Source List    : 1000        Zero Max Resp Code      : 0
Fault Length            : 1000        Invalid Multicast Group : 0
Bad Checksum            : 0
MLD Report invalid packet:
Fault Length            : 0           Invalid Multicast Group : 0
Invalid Multicast Source: 0           Bad Checksum            : 0
Illegal Report Type     : 0
MLD Done invalid packet:
Invalid Multicast Group : 0           Bad Checksum            : 0            
- -------------------------------------------------------------------

**Table 1** Description of the **display mld invalid-packet** command output
Item	Description
Statistics of invalid packets for public net	VPN instance in which statistics about invalid MLD messages need to be displayed.
MLD Query invalid packet	Invalid MLD Query messages.
MLD Report invalid packet	Invalid MLD Report messages.
MLD Done invalid packet	Invalid MLD Done messages.
Unwanted Source List	Messages with unwanted source lists.
Zero Max Resp Code	Messages with the Max Resp Code fields being 0.
Fault Length	Messages with invalid lengths.
Invalid Multicast Group	Messages with invalid multicast group addresses.
Invalid Multicast Source	Messages with invalid multicast source addresses.
Bad Checksum	Messages with checksum errors.
Illegal Report Type	Messages with the illegal Report message type.