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the address
is
unique.
With
the
appropriate
unicast
routing
topology, packets
addressed to a unicast address are delivered to a single interface.
•
Multicast
A multicast address identifies zero or more interfaces. With the appropriate
multicast routing topology, packets addressed to a multicast address are
delivered to all interfaces identified by the address.
•
Anycast
An anycast address identifies multiple interfaces. With the appropriate unicast
routing topology, packets addressed to an
anycast address are delivered to a
single
interface—the
nearest
interface
that
is
identified by the address. The
nearest interface is defined as being the closest in terms of routing distance. A
multicast
address
is
used
for
one-to-many communication, with delivery to
multiple
interfaces.
An
anycast
address
is
used
for
one-to-one-of- many
communication, with delivery to a single interface.
In all cases, IPv6 addresses identify interfaces, not nodes. A node is identified by any
unicast address assigned to any one of its interfaces. Also, it is worth to mention that
there is no broadcast address in IPv6. In IPv6, it is performed using multicast addresses.
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