Huawei Quidway s3700 series Configuration Manual page 51

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast
Figure 3-2
The router only needs to copy multicast data for the multicast VLAN and sends the data to the
switch. This saves network bandwidth and reduces workload of the router.
Figure 3-2 Multicast VLAN replication
Source
The S3700 supports the following mapping modes between multicast VLANs and user VLANs:
l
l
Multicast VLAN Replication Based on Interfaces
A carrier provides the multicast service for multiple Internet service providers (ISPs) and assigns
a multicast VLAN to each ISP to isolate multicast data and routes. The ISPs provide multicast
services for users on different interfaces. The interfaces may be added to the same user VLAN,
so multicast packets of an ISP may be sent to users that do not subscribe to services of this ISP.
To protect interests of ISPs, the carrier can bind user VLANs to multicast VLANs on the user-
side interfaces. As shown in
user-side interfaces, multicast data packets are only sent to user VLANs on the specified
interfaces.
Issue 01 (2011-10-26)
shows multicast data transmission after multicast VLAN replication is configured.
Multicast Packet
Multicast VLAN
VLAN 2
VLAN 3
VLAN 4
Router
One-to-many mapping between a multicast VLAN and user VLANs
Many-to-many mapping between multicast VLANs and user VLANs
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3 Multicast VLAN Replication Configuration
Figure 3-3, after multicast VLANs are bound to user VLANs on
VLAN 2
Switch
VLAN 3
VLAN 4
Receiver
HostA
Receiver
HostB
Receiver
HostC
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