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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 Snooping Proxy

Configuring MLD Snooping Proxy

To conserve network bandwidth, you can configure MLD snooping proxy on the devices. Then the devices work as proxy devices between the upstream devices and downstream hosts and substitute for them to send MLD messages, maintain group memberships, and forward multicast messages based on the group member interface information. Before configuring MLD snooping proxy, familiarize yourself with the applicable environment, complete the pre-configuration tasks, and obtain the required data. This can help you complete the configuration task quickly and accurately.

Usage Scenario

Forwarding entries are set up based on MLD messages exchanged between a Layer 3 device and user hosts. If there are many user hosts, redundant MLD messages increase the workload of the Layer 3 device.

To address the problem, MLD snooping proxy is generally deployed on a Layer 2 device between a Layer 3 device and hosts, allowing the Layer 2 device to process multicast protocol messages.

MLD snooping proxy allows a Layer 2 device to act as a Layer 3 device to send Query messages. It also allows a Layer 2 device to act as user hosts to respond to MLD Query messages. For example, on the network shown in Figure 18-15, MLD snooping proxy is configured on a CE.
  • Acting as a host, the CE collects, processes, and report Report and Done messages to the Layer 3 device. If a large number of users frequently join or leave multicast groups, the CE suppresses Report and Done messages, reducing message processing workload on the upstream Layer 3 device.
  • Acting as the Layer 3 device (PE), the CE sends Query messages and establishes the mapping between group members and interfaces using the MLD snooping function.

Generally, configure querier function on upstream devices in Layer 2 network and enable collect and process Report and Done messages.

Figure 18-15 Configuring MLD snooping proxy


In the preceding figure, the CE is a Layer 2 device on which MLD snooping proxy needs to be configured.

Pre-configuration Tasks

Before configuring the MLD snooping proxy, complete the following tasks:

  • Configure a link layer protocol to ensure link connectivity between devices.

  • Enable global MLD snooping.

Data Preparation

To configure MLD snooping proxy, you need the following data.




(Optional) Querier parameters, including the interval at which general Query messages are sent, number of group-specific Query messages to be sent, maximum time for a querier to wait for responses from hosts, and interval at which group-specific Query messages are sent

Configuration Procedures

Perform one or more of the following configurations as required.

Updated: 2019-01-03

Document ID: EDOC1100055017

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