Configuring Igmp Snooping; Establishing The Configuration Task - Huawei Quidway s3700 series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast
IGMP Snooping Proxying
Configuring IGMP snooping proxying 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 proxying 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:
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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.

2.3 Configuring IGMP Snooping

This section describes how to configure IGMP snooping in a VLAN.

2.3.1 Establishing the Configuration Task

Applicable Environment
Internet Group Management Protocol Snooping (IGMP snooping) is a Layer 2 multicast
protocol. The IGMP snooping protocol maintains information about the outgoing interfaces of
multicast packets by listening to multicast protocol packets exchanged between the router and
hosts. Thus the IGMP snooping protocol manages and controls the forwarding of multicast
packets.
Issue 01 (2011-10-26)
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.
To allow users to order specified multicast programs, configure a multicast group policy.
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.
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.
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