Ipv6 Addressing; Address Representation; Table 8: Compressed Ipv6 Formats - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide

IPv6 Addressing

Table 8: Compressed IPv6 Formats

IPv6 Address Type
Unicast
Multicast
Loopback
Unspecified
124
IPv6 enables you to chain extension headers together by using the next header field. The
next header field, located in the IPv6 header, indicates to the router which extension
header to expect next. If there are no more extension headers, the next header field
indicates the upper-layer header (TCP header, UDP header, ICMPv6 header, an
encapsulated IP packet, or other items).
IPv6 increases the size of the IP address from the 32 bits found in IPv4 to 128 bits. This
increased size provides for a broader range of addressing hierarchies and a much larger
number of addressable nodes.
In addition to the increased size, IPv6 addresses can be of different scopes that categorize
what types of applications are suitable for the address. IPv6 does not support broadcast
addresses, but uses multicast addresses to serve this role. In addition, IPv6 also defines
a new type of address called anycast.

Address Representation

IPv6 addresses consist of eight hexadecimal groups. Each hexadecimal group, separated
by a colon (:), consists of a 16-bit hexadecimal value. The following is an example of the
IPv6 format:
xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
A group of xxxx represents the 16-bit hexadecimal value. Each individual x represents a
4-bit hexadecimal value. The following is an example of a possible IPv6 address:
4FDE:0000:0000:0002:0022:F376:FF3B:AB3F
NOTE: Hexadecimal letters in IPv6 addresses are not case sensitive.
IPv6 Address Compression
IPv6 addresses often contain consecutive hexadecimal fields of zeros. To simplify address
entry, you can use two colons (::) to represent the consecutive fields of zeros when typing
the IPv6 address. Table 8 on page 124 provides compressed IPv6 address format examples.
Full Format
10FB:0:0:0:C:ABC:1F0C:44DA
FD01:0:0:0:0:0:0:1F
0:0:0:0:0:0:0:1
0:0:0:0:0:0:0:0
Compressed Format
10FB::C:ABC:1F0C:44DA
FD01::1F
::1
::
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