mld on-demand

Function

The mld on-demand command configures the Multicast Listener Discovery (MLD) group that an interface dynamically joins not to time out.

The undo mld on-demand command restores the default configuration.

By default, the records about dynamic join to multicast groups on an interface age periodically.

Format

mld on-demand

undo mld on-demand

Parameters

None

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, Loopback interface view, PW-VE sub-interface view, VE sub-interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
igmp	write

Usage Guidelines

Usage Scenario

MLD on-demand is used on a multicast device directly connected to an access device, not user hosts. MLD on-demand reduces packet exchanges between the access device and multicast device and reduces the load of these devices.

Configuration Impact

If a multicast device has MLD group records before MLD on-demand is enabled on the multicast device, the multicast device does not process these MLD group records after MLD on-demand is enabled on it.

Precautions

After the mld on-demand command is used, the following situations occur:

The multicast device interface connected to the access device sends only one MLD general query message to the access device.
The multicast device interface connected to the access device directly deletes the entry for a group after it receives an MLD Done message for the group.

Example

# Configure MLD on-demand on GE 0/1/0.

<HUAWEI> system-view
[~HUAWEI] multicast ipv6 routing-enable
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] ipv6 enable
[*HUAWEI-GigabitEthernet0/1/0] mld on-demand