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IPv6 addressing overview

FIGURE 34 IPv6 address format

As shown in Figure 34, 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:DB8:0000:0000:002D: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:DB8:0:0:2D:D0FF:FE48:4672.

• Compress the successive groups of zeros at the beginning, middle, or end of an IPv6 address

to two colons (::) once per address; for example, 2001:DB8::2D:D0FF:FE48:4672.

When specifying an IPv6 address in a command syntax, keep the following in mind:

• You can use the two colons (::) once in the address to represent the longest successive

hexadecimal fields of zeros.

• The hexadecimal letters in the IPv6 addresses are not case-sensitive.

As shown in Figure 34, the IPv6 network prefix is composed of the left-most bits of the address. As

with an IPv4 address, you can specify the IPv6 prefix using the prefix or prefix-length format, where

the following applies:

The prefix parameter is specified as 16-bit hexadecimal values separated by a colon.

The prefix-length parameter is specified as a decimal value that indicates the left-most bits of the

IPv6 address.

The following is an example of an IPv6 prefix:

2001:DB8:49EA:D088::/64

IPv6 address types

As with IPv4 addresses, you can assign multiple IPv6 addresses to a Brocade device interface.

Table 94 presents the three major types of IPv6 addresses that you can assign to a Brocade device

interface.

A major difference between IPv4 and IPv6 addresses is that IPv6 addresses support scope, which

describes the topology in which the address may be used as a unique identifier for an interface or

set of interfaces.

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 link-local addresses. Table 94 describes global and link-local addresses and

the topologies in which they are used.

• Multicast addresses support a scope field, which Table 94 describes.

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