11.1 Overview of MLD Snooping
When MLD snooping is enabled, the S7700 creates a Layer 2 forwarding table for multicast
data packets by listening to MLD messages. In this manner, the S7700 manages and controls
the forwarding of multicast data packets to ensure that these packets are sent only to the hosts
that need the multicast data.
If MLD snooping is disabled, IPv6 multicast packets are broadcast in the VLAN, which wastes
network bandwidth. MLD snooping has the following advantages:
l Reducing broadcast packets on the Layer 2 network to save network bandwidth
l Improving information security
l Implementing separate accounting of each host
11.2 MLD Snooping Features Supported by the S7700
This section describes the MLD snooping features supported by the S7700.
Basic Features of MLD Snooping
The S7700 supports the following basic features of MLD snooping:
l Supporting MLDv1 and MLDv2 packets
l Configuring VLAN-based multicast policies and multicast entries to control the access
from hosts in a VLAN to an IP multicast group
l Adding interfaces in a VLAN to a multicast group statically
l Configuring an interface in a VLAN as a static router interface to enable users to receive
multicast data steadily for a long time, because the static router interface never ages
l Responding to changes of the Layer 2 network and forwarding multicast data correctly
based on the new network topology
MLD Snooping Timers
On the S7700, you can set the following MLD snooping timers:
l Aging timer of the router interface in a VLAN.
By default, if the router interface receives an MLD Query message, the S7700 sets the
remaining aging time of the interface to 180 seconds. If the router interface receives a PIM
Hello message, the S7700 sets the remaining aging time of the interface to the value of the
holdtime field in the PIM Hello message.
l Maximum response time of MLD messages. This timer controls the deadline for a host to
report the membership.
l Robustness variable of MLD snooping in a VLAN. When sending the MLD Query
messages, the S7700 determines the retransmission count of an MLD message according
to the robustness variable.
l Interval for sending the MLD General Query messages. This timer helps the S7700 adapt
to the change of load on the network.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 11 MLD Snooping Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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