Configuration Guide User guide

BigIron RX Series Configuration Guide 1165
53-1002484-04
Chapter
43
IPv6 Addressing
In this chapter
•IPv6 addressing overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1165
•IPv6 addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1165
•IPv6 stateless autoconfiguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1168
IPv6 addressing overview
This chapter includes overview information about the following topics:
• IPv6 addressing.
• The IPv6 stateless autoconfiguration feature, which enables a host on a local link to
automatically configure its interfaces with new and globally unique IPv6 addresses associated
with its location.
IPv6 addressing
A limitation of IPv4 is its 32-bit addressing format, which is unable to satisfy potential increases in
the number of users, geographical needs, and emerging applications. To address this limitation,
IPv6 introduces a new 128-bit addressing format.
An IPv6 address is composed of 8 fields of 16-bit hexadecimal values separated by colons (:).
Figure 153 shows the IPv6 address format.
FIGURE 153 IPv6 address format
As shown in Figure 153, HHHH is a 16-bit hexadecimal value, while H is a 4-bit hexadecimal value.
The following is an example of an IPv6 address.
2001:0000:0000:0200:002D:D0FF:FE48:4672
Note that the sample IPv6 address includes hexadecimal fields of zeros. To make the address less
cumbersome, you can do the following:
• Omit the leading zeros; for example, 2001:0:0:200:2D:D0FF:FE48:4672.
Network Prefix
Interface ID
HHHH = Hex Value 0000 – FFFF
128 Bits
HHHH
HHHH HHHH HHHH HHHH HHHH HHHH HHHH