IPv6 Multicast Addresses
IPv6 does not define or use the concept of a broadcast IPv6 address, but it does define and use many types of IPv6 multicast addresses. Multicast addresses have an advantage for the network because only a subset of the hosts in the network will receive and process a packet sent to a multicast address, whereas packets sent to an IPv4 broadcast address arrive at all hosts.
IPv6 defines different types of multicast addresses based on the scope of where the packets should flow. In some cases, multicast messages need to stay within one subnet, but in other cases, they need to be able to flow to many subnets. To aid that logic, IPv6 defines some ranges of multicast addresses so that a packet sent to that address should stay ...
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