4-14 IPv6 Multicast VLAN ConfigurationOnly the S3100-EI series support IPv6 Multicast VLAN Configuration.When configuring IPv6 multicast VLAN, go to these sections for information you are interested in:z Introduction to IPv6 Multicast VLANz IPv6 Multicast VLAN Configuration Task Listz Configuring IPv6 Multicast VLANz Displaying and Maintaining IPv6 Multicast VLANz IPv6 Multicast VLAN Configuration ExamplesIntroduction to IPv6 Multicast VLANAs shown in Figure 4-1, in the traditional IPv6 multicast programs-on-demand mode, when hosts, HostA, 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 userVLAN to the Layer 2 device, Switch A. This results in not only waste of network bandwidth but also extraburden on the Layer 3 device.Figure 4-1 Multicast transmission without IPv6 multicast VLANThe IPv6 multicast VLAN feature configured on the Layer 2 device is the solution to this issue. With theIPv6 multicast VLAN feature, the Layer 3 device needs to replicate the multicast traffic only in the IPv6multicast VLAN instead of making a separate copy of the multicast traffic in each user VLAN. This savesthe network bandwidth and lessens the burden of the Layer 3 device.The IPv6 multicast VLAN feature can be implemented as described below:
