Huawei quidway s7700 - MLD Overview; MLD Features Supported by the S7700

10.1 MLD Overview
MLD is short for Multicast Listener Discovery. It has two versions: MLDv1 and MLDv2.
MLDv1 supports the ASM model and MLDv2 can directly support the SSM model.
The Multicast Listener Discovery (MLD) is a sub-protocol of the Internet Control Message
Protocol version 6 (ICMPv6). MLD is used to set up and maintain the membership of groups
between hosts and their directly connected multicast switchs. The functions and principles of
MLD are the same as those of the Internet Group Management Protocol (IGMP).MLD has the
following versions:
l MLDv1
MLDv1 is defined in RFC 2710, and is derived from IGMPv2. MLDv1 supports the Any-
Source Multicast (ASM) model. With the help of SSM mapping, MLDv1 can support the
Source-Specific Multicast (SSM) model.
l MLDv2
MLDv2 is defined in RFC 3810, and is derived from IGMPv3. MLDv2 supports the ASM
and SSM models.
10.2 MLD Features Supported by the S7700
The MLD features supported by the system include: basic MLD functions, static MLD groups,
configuring the range of groups that an interface can join, controlling the Router-Alert option
in an MLD packet, configuring parameters of an MLD Query message, SSM mapping, and
limiting the number of MLD group memberships.
Basic MLD Function
You can enable MLD and configure the MLD version.
Static MLD Group
You can configure an interface to statically join a multicast group. After the interface statically
joins a group, the system considers that the network segment where the interface resides has a
member of the group.
Configuring the Range of Groups that an Interface Can Join
You can set the range of groups that an interface can join as required.
Controlling the Router-Alert Option in an MLD Packet
You can determine whether to set the Router-Alert option in the MLD packets to be sent, and
whether to require that the received MLD packets contain the Router-Alert option.
Configuring Parameters of an MLD Query Message
You can set the interval for sending general query messages, MLD robustness variable, the
maximum response time of MLD Query messages, Keepalive period of other MLD queriers,
the interval for sending MLD group-specific query messages, and MLD fast leave.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 10 MLD Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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