Aggregatable global unicast addresses can be routed globally on the
IPv6 portion of the Internet known as the 6bone (IPv6 backbone).
These types of addresses are equivalent to public IPv4 addresses. As the
name implies, aggregatable global unicast addresses are designed to be
aggregated or summarized to produce an efficient routing infrastruc 
Anycast Addressing
An IPv6 anycast address is assigned to more than one interface, typi 
cally belonging to different nodes, with the property that a packet sent
to an anycast address is routed to the  nearest  interface having that
address, according to the routing protocol's measure of distance. 
Anycast addresses, when used as part of a route sequence, permits a
node to select which of several Internet service providers it wants to
carry its traffic. This capability is sometimes called  source selected
policies.  Anycast addressing is implemented by configuring anycast
addresses to identify the set of routers belonging to internet service
providers (for example, one anycast address per Internet service
provider). The anycast addresses can be used as intermediate addresses
in an IPv6 routing header to cause a packet to be delivered by means of
a particular provider or sequence of providers. Other possible uses of
anycast addresses are to identify the set of routers attached to a particu 
lar subnet, or the set of routers providing entry into a particular rout 
ing domain. 
Multicast Addressing
A multicast address is an identifier for a set of interfaces that typically
belong to different nodes. Each multicast group identifies two or more
packet recipients. A particular multicast address can be confined to a
single system, restricted within a specific site, associated with a partic 
ular network link, or distributed worldwide. When a packet is sent to a
multicast address, the protocol delivers the packet to all interfaces iden 
tified by that address.
IPv6 Efficient Hierarchy Addressing and Routing
IPv6 routing is almost exactly like IPv4 routing except for the length of
the address and the subnet mask. Although IPv4 uses a dotted decimal
representation of the network prefix known as the subnet mask, a sub 
net mask is not used for IPv6. Only the prefix length notation is sup 
As in the CIDR notation, the prefix length consists of the bits that have
the fixed values or are the bits of the network identifier. For example,
FE80::2AA:FF:FE9A:4CA2/64 indicates that the first 64 bits of the
address are the network prefix. Prefix notation is also used to express
network or subnet identifiers. For example, 21DA:D3::/48 is a subnet. 
The routing in IPv6 mirrors the classless concept, but IPv6 has a well 
defined set of boundaries from which to define sets of address space to
delegate downstream to other people who get Internet connectivity. 
At the level of the Internet backbone where major enterprises and ISP
networks come together, it is necessary to maintain a hierarchical
addressing system similar to the national and internal telephone sys 
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