Configuring Ipv6 Multicast Vlans; Overview - HP FlexFabric 5950 series Configuration Manual

Configuring IPv6 multicast VLANs

Overview

As shown in
multicast group. When Switch A (Layer 3 device) receives IPv6 multicast data for that group, it
forwards three copies of the data to Switch B (Layer 2 device). This occupies a large amount of
bandwidth and increases the burden on the Layer 3 device.
Figure 97 Multicast transmission without the IPv6 multicast VLAN feature
Source
After an IPv6 multicast VLAN is configured on Switch B, Switch A sends one copy of the IPv6
multicast data to the IPv6 multicast VLAN on Switch B. This saves network bandwidth and lessens
the burden on the Layer 3 device.
IPv6 multicast VLANs include sub-VLAN-based IPv6 multicast VLANs and port-based IPv6 multicast
VLANs.
Sub-VLAN-based IPv6 multicast VLAN
As shown in
•
Host A, Host B, and Host C are in VLAN 2 through VLAN 4, respectively.
•
On Switch B, VLAN 10 is an IPv6 multicast VLAN. VLAN 2 through VLAN 4 are sub-VLANs of
VLAN 10.
•
MLD snooping is enabled for the multicast VLAN and its sub-VLANs.
Figure 97, Host A, Host B, and Host C are in different VLANs and the same IPv6
IPv6 Multicast packets
VLAN 2
VLAN 3
VLAN 4
Switch A Switch B
MLD querier
Figure 98:
VLAN 2
VLAN 3
VLAN 4
335
Receiver
Host A
Receiver
Host B
Receiver
Host C