Brocade Communications Systems ICX 7250 series, Руководство по настройке

Страница: 126 / 483

• The hexadecimal letters in IPv6 addresses are not case-sensitive.
As shown in Figure 10 , 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 network portion 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.
TABLE 23 IPv6 address types
Address type Description Address structure
Unicast An address for a single interface. A packet sent
to a unicast address is delivered to the interface
identified by the address. Depends on the type of the unicast address:
• Aggregatable global address--An
address equivalent to a global or
public IPv4 address. The address
structure is as follows: a fixed prefix of
2000::/3 (001), a 45-bit global
routing prefix, a 16-bit subnet ID, and
a 64-bit interface ID.
• Site-local address--An address used
within a site or intranet. (This address
is similar to a private IPv4 address.) A
site consists of multiple network links.
The address structure is as follows: a
fixed prefix of FEC0::/10 (1111
1110 11), a 16-bit subnet ID, and a
64-bit interface ID.
• Link-local address--An address used
between directly connected nodes on
a single network link. The address
structure is as follows: a fixed prefix of
FE80::/10 (1111 1110 10) and a
64-bit interface ID.
• IPv4-compatible address--An
address used in IPv6 transition
mechanisms that tunnel IPv6 packets
dynamically over IPv4 infrastructures.
The address embeds an IPv4 address
in the low-order 32 bits and the high-
IPv6 addressing overview
Brocade FastIron Layer 3 Routing Configuration Guide
126 53-1003903-04