IGMP Snooping Querier
On a multicast network running IGMP, there should be a Layer 3 multicast device functioning
as an IGMP querier to send IGMP Query messages and create and maintain multicast forwarding
entries for normal multicast data forwarding.
If a multicast network does not have Layer 3 devices and Layer 2 devices do not support IGMP,
no IGMP querier can be configured. To solve such a problem, configure an IGMP snooping
querier on the Layer 2 device so that the Layer 2 device can create and maintain multicast
forwarding entries at the data link layer, implementing multicast data forwarding.
IGMP Snooping Proxy
Configuring IGMP snooping proxy on an edge device can reduce the number of IGMP Report
and Leave messages received by an upstream Layer 3 device and improve performance of the
upstream Layer 3 device. The device configured with IGMP snooping proxy functions as a host
for its upstream device and a querier for its downstream host.
IGMP Snooping Policies
Different IGMP snooping policies can be configured based on different requirements:
l To limit the number of multicast programs available to users and multicast data traffic on
an interface, set the maximum number of multicast groups that the interface can join.
l To allow users to order specified multicast programs, configure a multicast group policy.
l To reduce the number of packets transmitted over the network, configure IGMP message
suppression so that only the first IGMP Report or Leave message can be forwarded.
l If multicast services are stable, for example, the static Layer 2 multicast service, unknown
multicast data packets do not need to be processed. You can enable the discarding of
multicast data packets in such a case.
IGMP Snooping SSM Mapping
In the SSM model, if IGMPv3 is run on a receiver host, you can specify the multicast source for
IGMPv3 multicast data packets; if only IGMPv1 or IGMPv2 can be run on the receiver host,
you cannot specify the multicast source for IGMPv1 or IGMPv2 multicast data packets. IGMP
snooping SSM mapping is a solution. It generates a mapping between a multicast group and a
multicast source. (*, G) information in IGMPv1 or IGMPv2 multicast data packets is then
mapped to (S, G) information, providing SSM services for the hosts running IGMPv1 or
IGMPv2.
Static Multicast MAC Address
In Layer 2 multicast, you can dynamically create multicast MAC address entries using Layer 2
multicast protocols such as IGMP snooping or manually configure multicast MAC address
entries. After a multicast MAC address is configured on an interface, the MAC address is bound
to the interface and multicast packets destined for this MAC address are forwarded only by this
interface.
Layer 2 Multicast CAC
CAC is short for Call Admission Control. The Layer 2 multicast CAC is a part of the IPTV
multicast solution. This function limits the number of IPTV programs in Layer 2 multicast,
ensuring the service quality for most users. This function has the following advantages:
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 2 IGMP Snooping Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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