display mld invalid-packet

Function

The display mld invalid-packet command displays statistics and details about invalid MLD packets received by a device.

Format

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

display mld invalid-packet [ packet-number ] verbose

Parameters

Parameter	Description	Value
interface interface-type interface-number	Displays statistics about invalid MLD messages received by a specified interface. If this parameter is not specified, the command displays statistics about invalid MLD messages on all interfaces.	-
message-type	Displays statistics about invalid MLD messages of a specified type.	-
done	Displays statistics about invalid Multicast Listener Done messages.	-
query	Displays statistics about invalid Query messages.	-
report	Displays statistics about invalid Multicast Listener Report messages.	-
packet-number	Displays details of a specified number of invalid MLD messages recently received.	The value is an integer that ranges from 1 to 100.
verbose	Displays details of invalid MLD messages.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

You can run the display mld invalid-packet command to view statistics and details 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. If the command output contains statistics about invalid MLD messages, you need to run the display mld invalid-packet [ packet-number ] verbose command to view details of invalid MLD messages to locate the fault.

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 interface-type interface-number command to view statistics about invalid MLD messages received by a specified interface.
Run the display mld invalid-packet packet-number verbose command to view details of invalid MLD messages recently received. Currently, details of a maximum of 100 invalid MLD messages can be displayed.

Example

# Display statistics about invalid MLD messages received by the device.

<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	Invalid packets received in the public net.
MLD Query invalid packet	Invalid MLD Query 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.
Bad Checksum	Messages with checksum errors.
MLD Report invalid packet	Invalid MLD Report messages.
Invalid Multicast Source	Messages with invalid multicast source addresses.
Illegal Report Type	Messages with the illegal Report message type.
MLD Done invalid packet	Invalid Multicast Listener Done messages.

# Display details of one invalid MLD message recently received by the device.

<HUAWEI> display mld invalid-packet 1 verbose
       Detailed information of invalid packets
-----------------------------------------------------
Packet information (Index 1):
-----------------------------------------------------
Interface           :  Vlanif100
Time                :  2012-06-09 11:03:51 UTC-08:00
Message Length      :  24
Invalid Type        :  Invalid Multicast Group
0000: 84 00 4c d7 00 00 00 00 11 17 00 00 00 00 00 00
0010: 00 00 00 00 00 01 00 01
-----------------------------------------------------

**Table 2** Description of the **display mld invalid-packet 1 verbose** command output
Item	Description
Detailed information of invalid packets	Details of the invalid MLD message.
Packet information (Index 1)	Sequence number of the invalid MLD message (numbered in the opposite order that the message is received).
Interface	Interface receiving the invalid MLD message.
Time	Time when the invalid MLD message is received, in any of the following formats: YYYY-MM-DD HH:MM:SS YYYY-MM-DD HH:MM:SS UTC±HH:MM DST YYYY-MM-DD HH:MM:SS UTC±HH:MM YYYY-MM-DD HH:MM:SS DST UTC±HH:MM indicates that a time zone is configured using the clock timezone command; DST indicates that the daylight saving time is configured using clock daylight-saving-time command.
Message Length	Length of the invalid MLD message.
Invalid Type	Type of the invalid MLD message: Unwanted Source List Zero Max Resp Code Fault Length Invalid Multicast Group Bad Checksum Invalid Multicast Source Illegal Report Type
0000: 84 00 4c d7 00 00 00 00 11 17 00 00 00 00 00 00 0010: 00 00 00 00 00 01 00 01	Contents of the invalid MLD message.