H3C Technologies H3C S10500 Series Switches - Manual (Page 321)

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Figure 78 Sub-VLAN-based IPv6 multicast VLAN
Source Router A
MLD querier
VLAN 2
VLAN 3
VLAN 4
Switch A
Receiver
Host A
Receiver
Host B
Receiver
Host C
IPv6 Multicast packets
VLAN 2
VLAN 3
VLAN 4
VLAN 10 (IPv6 Multicast VLAN)
After the configuration, MLD snooping manages router ports in the IPv6 multicast VLAN and member
ports in the sub-VLANs. When forwarding multicast data to Switch A, Router A sends only one copy of
multicast data to Switch A in the IPv6 multicast VLAN, and Switch A distributes the data to the sub-VLANs
that contain receivers.
Port-based IPv6 multicast VLAN
As shown in Figure 79 , 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.
Figure 79 Port-based IPv6 multicast VLAN
After the configuration, if Switch A receives an MLD message on a user port, it tags the message with the
IPv6 multicast VLAN ID and relays it to the MLD querier, so that MLD snooping can uniformly manage the
router ports and member ports in the IPv6 multicast VLAN. When Router A forwards multicast data to
Switch A, it sends only one copy of multicast data to Switch A in the IPv6 multicast VLAN, and Switch A
distributes the data to all member ports in the IPv6 multicast VLAN.