H3C Technologies H3C S12500-X Series Switches - Manual (Page 19)

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Figure 7 IPv6-to-MAC address mapping
IMPORTANT:
Because of the duplicate mapping from multicast IP address to multicast MAC address, the device might
inadvertently send multicast protocol packets as multicast data in Layer 2 forwarding. To avoid this, do not
use the IP multicast addresses that are mapped to multicast MAC addresses 0100-5E00-00xx and
3333-0000-00xx (where "x" specifies any hexadecimal number from 0 to F).
Multicast protocols
Multicast protocols include the following categories:
• Layer 3 and Layer 2 multicast protocols:
{
Layer 3 multicast refers to IP multicast working at the network layer.
Layer 3 multicast protocols—IGMP, MLD, PIM, IPv6 PIM, MSDP, MBGP, and IPv6 MBGP.
{
Layer 2 multicast refers to IP multicast working at the data link layer.
Layer 2 multicast protocols—IGMP snooping, MLD snooping, PIM snooping, IPv6 PIM
snooping, multicast VLAN, and IPv6 multicast VLAN.
• IPv4 and IPv6 multicast protocols:
{
For IPv4 networks—IGMP snooping, PIM snooping, multicast VLAN, IGMP, PIM, MSDP, and
MBGP.
{
For IPv6 networks—MLD snooping, IPv6 PIM snooping, IPv6 multicast VLAN, MLD, IPv6 PIM,
and IPv6 MBGP.
This section provides only general descriptions about applications and functions of the Layer 2 and Layer
3 multicast protocols in a network. For more information about these protocols, see the related chapters.
NOTE:
The switches support IGMP snooping, MLD snooping, IGMP, MLD, PIM, and IPv6 PIM.
Layer 3 multicast protocols
Layer 3 multicast protocols include multicast group management protocols and multicast routing
protocols.