Multicast IP over IEEE 802 LANs

• MAC address = 6 bytes = OUI + 3-byte address
• Special OUI for IETF: 0x01-00-5E.
  • Of remaining 3 bytes (24 bits), one bit is reserved
  • Remaining 23 bits = lower order 23 bits from IP class D address. Simpler than unicast forwarding ! No ARP etc.
• 32 class D addrs may map to one MAC addr

1110 xxxx x yyy yyyy yyyy yyyy yyyy yyyy

00000001 00000000 0101 1110 yyy yyyy yyyy yyyy yyyy yyyy

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