5-1
5 IPv6 Multicast VLAN Configuration
When configuring IPv6 multicast VLAN, go to these sections for information you are interested in:
z Introduction to IPv6 Multicast VLAN
z Multicast VLAN Configuration Task List
z Configuring IPv6 Sub-VLAN-Based IPv6 Multicast VLAN
z Configuring Port-Based IPv6 Multicast VLAN
z Displaying and Maintaining IPv6 Multicast VLAN
z IPv6 Multicast VLAN Configuration Examples
Introduction to IPv6 Multicast VLAN
As shown in Figure 3-1, in the traditional IPv6 multicast programs-on-demand mode, when hosts, Host
A, Host B and Host C, belonging to different VLANs require IPv6 multicast programs on demand
service, the Layer 3 device, Router A, needs to 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 5-1 Multicast transmission without IPv6 multicast VLAN
The IPv6 multicast VLAN feature configured on the Layer 2 device is the solution to this issue. With the
IPv6 multicast VLAN feature, the Layer 3 device needs to replicate the multicast traffic only in the IPv6
multicast VLAN instead of making a separate copy of the multicast traffic in each user VLAN. This
saves the network bandwidth and lessens the burden of the Layer 3 device.
The IPv6 multicast VLAN feature can be implemented in two approaches, as described below:
Sub-VLAN-based IPv6 multicast VLAN
As shown in Figure 5-2, Host A, Host B and Host C are in three different user VLANs. On Switch A,
configure VLAN 10 as an IPv6 multicast VLAN, configure all the user VLANs as sub-VLANs of this
IPv6 multicast VLAN, and enable MLD snooping in the IPv6 multicast VLAN.
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