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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring MLD On-demand

Configuring MLD On-demand

Multicast Listener Discovery (MLD) on-demand helps to maintain MLD group memberships and frees a multicast device and its connected access device from exchanging a large number of packets.

Usage Scenario

When a multicast device is directly connected to user hosts, the multicast device sends MLD Query messages to and receives MLD Report and Done messages from the user hosts to identify the multicast groups that have attached receivers on the shared network segment. The device directly connected to a multicast device, however, may not be a host but an MLD proxy-capable access device.

If a multicast device is directly connected to an MLD proxy-capable access device, enable MLD on-demand on the multicast device. The multicast device sends only one general query message to the access device. After receiving the general query message, the access device sends the collected Join and Leave status of multicast groups to the multicast device. The multicast device uses the Join and Leave status of the multicast groups to maintain multicast group memberships on the local network segment.

MLD on-demand reduces packet exchanges between a multicast device and its connected access device and reduces the loads of these devices.

Pre-configuration Tasks

Before configuring MLD on-demand, complete the following tasks:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run mld on-demand

    The MLD group that an interface dynamically joins is configured not to time out.

  4. Run commit

    The configuration is committed.

Checking the Configurations

Run the display mld interface command to check MLD on-demand configurations on an interface.

# Check MLD on-demand configurations on interface Vlanif75.

<HUAWEI> display mld interface Vlanif 75
Interface information
 Vlanif 75(FE80::225:9FFF:FE00:4A):
   MLD is enabled
   Current MLD version is 2
   MLD state: up
   MLD group policy: none
   Value of query interval for MLD (negotiated): 125 s
   Value of query interval for MLD (configured): 125 s
   Value of other querier timeout for MLD: 0 s
   On-demand is enabled
   Value of maximum query response time for MLD: 10 s
   Querier for MLD: FE80::225:9FFF:FE00:4A (this router)
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Updated: 2019-01-03

Document ID: EDOC1100055017

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