10 MLD Configuration
About This Chapter
On an IPv6 network, by configuring MLD on an interface of a multicast device connected with
the user network segment, you can manage group members on the local network.
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.
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.
10.3 Configuring Basic MLD Functions
By configuring basic MLD functions on an interface of a multicast device connected with the
user network segment, you can enable a user host to access the multicast network and receive
multicast data packets.
10.4 Configuring Options of an MLD Packet
You can enable a multicast device to filter MLD Report messages and receive only the MLD
messages with Router-Alert options by configuring options of MLD messages.
10.5 Configuring MLD Query Control
An MLD querier periodically sends MLD Query messages on a shared network segment to
refresh information about IGMP group members. MLD parameters configured on all the
interfaces of the multicast devices on the same network segment with the user host should be
consistent; otherwise, a fault occurs on the network.
10.6 Configuring SSM Mapping
In the network segment where multicast services are provided in the SSM mode, the interface
of the multicast device runs MLDv2 while certain hosts can run only MLDv1 due to various
limitations. To ensure that the multicast device running a later IGMP version is compatible with
the hosts running an earlier IGMP version and provides SSM services for these hosts, you need
to configure static SSM mapping on the multicast device.
10.7 Configuration MLD Limit Function
If you want to restrict the servable IPTV ICPs and the number of access users on an IP core
network, the MLD limit function is required. Configuring the MLD limit function involves
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.
355
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