Multicast Protocols - HP MSR2003 Configuration Manual

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" represents 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 and MLD snooping.
• IPv4 and IPv6 multicast protocols:
For IPv4 networks—IGMP snooping, IGMP, PIM, MSDP, and MBGP.
For IPv6 networks—MLD snooping, 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.
Layer 3 multicast protocols
Layer 3 multicast protocols include multicast group management protocols and multicast routing
protocols.
Figure 7 IPv6-to-MAC address mapping
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