H3c-technologies H3C S3100V2 Series Switches Manuel d'utilisateur télécharger pdf (Page 59)

Multicast VLAN configuration

This chapter includes these sections:

• Introduction to multicast VLAN

• Multicast VLAN configuration task list

• Configuring port-based multicast VLAN

• Displaying and maintaining multicast VLAN

• Multicast VLAN configuration examples

Introduction to multicast VLAN

In the traditional multicast programs-on-demand mode shown in Figure 18, when hosts—Host A, Host B

and Host C—that belong to different VLANs require multicast programs on demand service, the Layer 3

device—Router A—must forward a separate copy of the multicast traffic in each user VLAN to the Layer

2 device—Switch A. This results in not only waste of network bandwidth but also extra burden on the

Layer 3 device.

Figure 18 Multicast transmission without multicast VLAN

The multicast VLAN feature configured on the Layer 2 switch is the solution to this issue. With the multicast

VLAN feature, the Layer 3 device must replicate the multicast traffic only in the multicast VLAN instead of

making a separate copy of the multicast traffic in each user VLAN. This saves network bandwidth and

lessens the burden on the Layer 3 device.

The multicast VLAN feature can be implemented by the following approaches:

As shown in Figure 19, Ho

st A, Host B and Host C are in three different user VLANs. All user ports—ports

with attached hosts—on Switch A are hybrid ports. On Switch A, configure VLAN 10 as a multicast

VLAN, assign all user ports to this multicast VLAN, and enable IGMP snooping in the multicast VLAN

and all user VLANs.

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H3c-technologies H3C S3100V2 Series Switches Manuel d'utilisateur Page 59