Non-Unique Multicast Addresses
Take low-order 23 bits of IP group address, use as low-order 23 bits for Ethernet multicast address, using 01:00:5e (plus one 0-bit) as prefix
32 groups share same layer 2 address
Example: group address 224.9.12.3
- MAC address 01:00:5e:09:0c:03