![]() The high-order 4 bits for the destination IP multicast address are set to 1110 binary (0b1110). The lower-order 23 bits of the destination IP multicast address are mapped to the lower-order 23 bits of the MAC address. These bits are part of the organizational unit identifiers (OUI). The high-order 25 bits is the official reserved multicast MAC address range from 0100.5E00.0000 to (request for Comment 1112). The sending device must convert the destination IP multicast address into a special MAC address as follows: What happens when it is a multicast message? To optimize network resources, an Ethernet switch also needs to understand multicast. As discussed in Chapter 1, when a device sends a broadcast frame, the destination address is all ones, and a unicast message is the destination MAC address. A traditional Ethernet switch (Layer 2 device) works with Ethernet frames, and a traditional router (Layer 3 device) looks at packets to make decisions on how messages will be handled. ![]()
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