95
Configuring IPv6 multicast VLANs (available
only on the HP 3100 v2 EI)
Overview
As shown in
, in the traditional IPv6 multicast programs-on-demand mode, when hosts (Host A,
Host B, and Host C), which belong to different VLANs, require IPv6 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 29
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.
As shown in
, Host A, Host B, and Host C are in different user VLANs. All the user ports are
hybrid ports. On Switch A, configure VLAN 10 as an IPv6 multicast VLAN, assign all the user ports to
VLAN 10, and enable MLD snooping in the IPv6 multicast VLAN and all user VLANs.
Source
Receiver
Host A
IPv6 Multicast packets
VLAN 2
VLAN 3
VLAN 4
VLAN 2
VLAN 3
VLAN 4
Switch A
Receiver
Host B
Receiver
Host C
Router A
MLD querier