Address Representation; Address Types; Address Scope - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
532
This section discusses the following topics that provide background information about
IPv6 addressing:
Address Representation on page 532
Address Types on page 532
Address Scope on page 532
Address Structure on page 533

Address Representation

IPv6 addresses consist of 8 groups of 16-bit hexadecimal values separated by colons
( ). The IPv6 address format is as follows:
:
aaaa:aaaa:aaaa:aaaa:aaaa:aaaa:aaaa:aaaa
is a 16-bit hexadecimal value, and
aaaa
example of an actual IPv6 address:
3FFE:0000:0000:0001:0200:F8FF:FE75:50DF
You can omit the leading zeros, as shown:
3FFE:0:0:1:200:F8FF:FE75:50DF
You can compress 16-bit groups of zeros to the notation
but only once per address:
3FFE::1:200:F8FF:FE75:50DF

Address Types

There are three types of IPv6 addresses:
Unicast—For a single interface.
Multicast—For a set of interfaces on the same physical medium. A packet is sent to all
of the interfaces associated with the address.
Anycast—For a set of interfaces on different physical mediums. A packet is sent to only
one of the interfaces associated with this address, not to all the interfaces.

Address Scope

IPv6 addresses have scope, which identifies the application suitable for the address.
Unicast and multicast addresses support scoping.
Unicast addresses support two types of scope: global scope and local scope. There are
two types of local scope: link-local addresses and site-local addresses. Link-local unicast
addresses are used within a single network link. The first ten bits of the prefix identify the
address as a link-local address. Link-local addresses cannot be used outside a network
link. Site-local unicast addresses are used within a site or intranet. A site consists of
multiple network links, and site-local addresses identify nodes inside the intranet.
Site-local addresses cannot be used outside the site.
is a 4-bit hexadecimal value. Following is an
a
:: (two colons), as shown here,
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