display mld group

Function

The display mld group command displays multicast group information generated by using Source-Specific Multicast (SSM) mapping rules configured by using the ssm-mapping command.

Format

display mld group [ GrpAddr6 | interface { port-type port-num | port-name } ] ^* [ ssm-mapping ] [ verbose ]

display mld { vpn-instance vpn-instance-name | all-instance } group [ GrpAddr6 | interface { port-type port-num | port-name } ] ^* [ ssm-mapping ] [ verbose ]

Parameters

Parameter	Description	Value
GrpAddr6	Specifies an IPv6 multicast group address.	The value is in hexadecimal notation and in the format of FFxA:xxxx:xxxx::xxxx, in which x ranges from 0 to F and A is 0 or ranges from 3 to F.
interface port-type port-num	Specifies the type and number of an interface.	-
interface port-name	Specifies an interface name.	-
ssm-mapping	Displays multicast group information generated by using SSM mapping rules.	-
verbose	Displays detailed multicast group information generated by using SSM mapping rules.	-
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

When running the display mld group command, note the following points:

If interface port-type port-number is specified, only multicast group information generated by using SSM mapping rules on a specified interface is displayed.
If verbose is specified, various status parameters of multicast group information generated by using SSM mapping rules are displayed.

Example

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

# Display detailed multicast group information generated by using SSM mapping rules on the router.

<HUAWEI> display mld group ssm-mapping verbose
Interface group report information of VPN-Instance: public net
 GigabitEthernet0/1/0(FE80:1::101):
  Total entry on this interface: 1
  Total 1 MLD SSM-Mapping Group reported
   Group: FF37::1
     Uptime: 00:00:21
     Expires: 00:03:59
     Last reporter: FE80::208:A1FF:FE83:F82A
     Last-listener-query-counter: 0
     Last-listener-query-timer-expiry: off
     Version1-host-present-timer-expiry: off
     Source list:
       Source: 2001:DB8:1::1
       Uptime: 00:00:21
       Source: 2001:DB8:1::2
       Uptime: 00:00:21
       Source: 2001:DB8:1::3
       Uptime: 00:00:21

**Table 1** Description of the **display mld group** command output
Item	Description
Interface group report information of VPN-Instance	VPN instance to which multicast group information on an interface belongs.
Total entry on this interface	Number of multicast entries generated by using SSM mapping rules on an interface.
Total 1 MLD SSM-Mapping Group reported	Total number of Multicast Listener Discovery (MLD) SSM-mapping groups.
Group	Multicast group address.
Last reporter	Link-local address of the last host that sends a Report message.
Source	source address.
Source list	source address list.
GigabitEthernet0/1/0(FE80:1::101)	Interface configured with SSM mapping (interface address).
Uptime	Time since an MLD group is discovered The time format is as follows: If the time is shorter than or equal to 24 hours, the format is hours:minutes:seconds. If the time is longer than 24 hours but shorter than or equal to one week, the format is days:hours. If the time is longer than one week, the format is weeks:days.
Expires	Interval for deleting records from the MLD group list.
Last-listener-query-counter	Number of times that last-listener query messages are sent.
Last-listener-query-timer-expiry	Interval for sending last-listener query messages.
Version1-host-present-timer-expiry	Timeout period of an MLDv1 host.