Well Known Ethernet Multicast Address - Embeddist

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Ethernet frames with a value of 1 in the least-significant bit of the first octet[note 2] of the destination address are treated as multicast frames and are flooded to all points on the network. While frames with ones in all bits of the destination address (FF:FF:FF:FF:FF:FF) are sometimes referred to as broadcasts, Ethernet network equipment generally does not distinguish between multicast and broadcast frames. Modern Ethernet controllers filter received packets to reduce CPU load, by looking up the hash of a multicast destination address in a table, initialized by software, which controls whether a multicast packet is dropped or fully received.

• Some well known Ethernet multicast addresses

  Ethernet multicast address	Type Field	Usage
  01:00:0C:CC:CC:CC	0x0802	CDP |(Cisco Discovery Protocol), VTP (VLAN Trunking Protocol)
  01:00:0C:CC:CC:CD	0x0802	Cisco Shared Spanning Tree Protocol Address
  01:80:C2:00:00:00	0x0802	Spanning Tree Protocol (for bridges) IEEE 802.1D
  01:80:C2:00:00:00, or 01:80:C2:00:00:03, or 01:80:C2:00:00:0E	0x88CC	Link Layer Discovery Protocol
  01:80:C2:00:00:08	0x0802	Spanning Tree Protocol (for provider bridges) IEEE 802.1ad
  01:80:C2:00:00:01	0x8808	Ethernet flow control (Pause frame) IEEE 802.3x
  01:80:C2:00:00:02	0x8809	Ethernet OAM Protocol IEEE 802.3ah (A.K.A. “slow protocols”)
  01:80:C2:00:00:30 to 01:80:C2:00:00:3F	0x8902	Ethernet CFM Protocol IEEE 802.1ag
  01:00:5E:00:00:00 – 01:00:5E:7F:FF:FF	0x0800	IPv4 Multicast (RFC 1112), insert the low 23 Bits of the multicast IPv4 Address into the Ethernet Address (RFC 7042 2.1.1.)
  33:33:xx:xx:xx:xx	0x86DD	IPv6 Multicast (RFC 2464), insert the low 32 Bits of the multicast IPv6 Address into the Ethernet Address (RFC 7042 2.3.1.)
  01:1B:19:00:00:00, or 01:80:C2:00:00:0E	0x88F7	Precision Time Protocol (PTP) version 2 over Ethernet (Layer-2)

• source : https://en.wikipedia.org/wiki/Multicast_address

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