Unicast and multicast addresses support scoping as follows:
•
Unicast addresses support two types of scope: global scope and local scope. In turn, local scope supports site-local addresses
and link-local addresses.
describes global, site-local, and link-local addresses and the topologies in which
they are used.
•
Multicast addresses support a scope field, which
describes.
TABLE 29
IPv6 address types
Address type
Description
Address structure
Unicast
An address for a single interface. A packet sent
to a unicast address is delivered to the interface
identified by the address.
Depends on the type of the unicast address:
•
Aggregatable global address--An
address equivalent to a global or
public IPv4 address. The address
structure is as follows: a fixed prefix of
2000::/3 (001), a 45-bit global
routing prefix, a 16-bit subnet ID, and
a 64-bit interface ID.
•
Site-local address--An address used
within a site or intranet. (This address
is similar to a private IPv4 address.) A
site consists of multiple network links.
The address structure is as follows: a
fixed prefix of FEC0::/10 (1111
1110 11), a 16-bit subnet ID, and a
64-bit interface ID.
•
Link-local address--An address used
between directly connected nodes on
a single network link. The address
structure is as follows: a fixed prefix of
FE80::/10 (1111 1110 10) and a
64-bit interface ID.
•
IPv4-compatible address--An
address used in IPv6 transition
mechanisms that tunnel IPv6 packets
dynamically over IPv4 infrastructures.
The address embeds an IPv4 address
in the low-order 32 bits and the high-
order 96 bits are zeros. The address
structure is as follows:
0:0:0:0:0:0:A.B.C.D.
•
Loopback address--An address
(0:0:0:0:0:0:0:1 or ::1) that a switch
can use to send an IPv6 packet to
itself. You cannot assign a loopback
address to a physical interface.
•
Unspecified address--An address
(0:0:0:0:0:0:0:0 or ::) that a node can
use until you configure an IPv6
address for it.
Multicast
An address for a set of interfaces belonging to
different nodes. Sending a packet to a multicast
address results in the delivery of the packet to all
interfaces in the set.
A multicast address has a fixed prefix of
FF00::/8 (1111 1111). The next 4 bits define
the address as a permanent or temporary
address. The next 4 bits define the scope of the
address (node, link, site, organization, global).
Anycast
An address for a set of interfaces belonging to
different nodes. Sending a packet to an anycast
address results in the delivery of the packet to
the closest interface identified by the address.
An anycast address looks similar to a unicast
address, because it is allocated from the unicast
address space. If you assign a unicast address to
multiple interfaces, it is an anycast address. An
IPv6 addressing overview
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