To create a Media Access Control (MAC) address that is mapped from a multicast IPv6 address, prepend 3333 to the last four octets of the IPv6 address. This procedure is described in Internet Engineering Task Force (IETF) Request for Comments (RFC) 2464.

The IPv6 prefix FF00::/8 is generally used for multicast addresses. IPv6 addresses in the FF00::/8 range begin with the characters FF00 through FFFF. However, you would not prepend FF to the last five octets of the IPv6 address, nor would you prepend FFFF to the last four octets of the IPv6 address in order to create a MAC address that is mapped from a multicast IPv6 address.

You would not prepend 0100.0CCC to the last two octets of the IPv6 address. Multicast MAC address 0100.0CCC.CCCC is used by Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), Port Aggregation Protocol (PAgP), UniDirectional Link Detection (UDLD), and VLAN Trunking Protocol (VTP).

CDP is a Layer 2 Ciscoproprietary protocol that is used to advertise and discover only directly connected Cisco devices on a local network. DTP is a point-to-point protocol that is used to negotiate trunking. PAgP is an EtherChannel aggregation protocol. UDLD monitors a link to verify that both ends of thelink are functioning.

VTP is used to centrally manage virtual LAN (VLAN) changes and to propagate those changes over trunk ports. Multicast MAC address 0100.0CCC.CCCD is used by 802.1D Spanning Tree Protocol (STP) to send nonnative VLAN bridge protocol data units (BPDUs).

You would not prepend 0180.C200 to the last two octets of the IPv6 address. Multicast MAC address 0180.C200.0000 is used by 802.1D STP to send native VLAN BPDUs. Multicast MAC address 0180.C200.0003 is used by 802.1X. Multicast MAC address 0180.C200.000E is used by Link Layer Discovery Protocol (LLDP).