For IPv4 multicast, the MAC mapping uses 01-00-5E followed by the low-order 23 bits of the multicast IP address. Because an IPv4 multicast address has 28 variable bits (224/4), 5 bits are not mapped to the MAC. Therefore, 2⁵ = 32 distinct multicast IP addresses can map to the same multicast MAC address.
[References: HCIP-Access V2.5 – Multicast Addressing and L2 MAC Mapping; Huawei Multicast Fundamentals – IPv4 Multicast IP-to-MAC Mapping., , ]
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