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FIGURE 17 IPv6 address format

As shown in the above figure, 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 this 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.

• 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::200:2D:D0FF:FE48:4672.

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

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

hexadecimal fields of zeros

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

As shown in Figure 17 , 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 / 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 switch interface. IPv6 address

types presents the three major types of IPv6 addresses that you can assign to a switch 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 site-local addresses and link-local addresses. IPv6 address types describes global, site-

local, and link-local addresses and the topologies in which they are used.

• Multicast addresses support a scope field, which IPv6 address types describes.

IPv6 address types

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