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Chapter 8 Basic Setting
Table 14 Global Address Format
001
Global ID
3 bits
45 bits
The global ID is the network identifier or prefix of the address and is used for routing. This may be
assigned by service providers.
The subnet ID is a number that identifies the subnet of a site.
8.6.7 Unspecified
An unspecified address (0:0:0:0:0:0:0:0 or ::) is used as the source address when a device does
not have its own address. It is similar to "0.0.0.0" in IPv4.
8.6.8 EUI-64
The EUI-64 (Extended Unique Identifier) defined by the IEEE (Institute of Electrical and Electronics
Engineers) is an interface ID format designed to adapt with IPv6. It is derived from the 48-bit (6-
byte) Ethernet MAC address as shown next. EUI-64 inserts the hex digits fffe between the third and
fourth bytes of the MAC address and complements the seventh bit of the first byte of the MAC
address. See the following example.
MAC
EUI-64
8.6.9 Stateless Autoconfiguration
With stateless autoconfiguration in IPv6, addresses can be uniquely and automatically generated.
Unlike DHCPv6 (Dynamic Host Configuration Protocol version six) which is used in IPv6 stateful
autoconfiguration, the owner and status of addresses don't need to be maintained by a DHCP
server. Every IPv6 device is able to generate its own and unique IP address automatically when
IPv6 is initiated on its interface. It combines the prefix and the interface ID (generated from its own
Ethernet MAC address, see
When IPv6 is enabled on a device, its interface automatically generates a link-local address
(beginning with fe80).
When the interface is connected to a network with a router and the ipv6 address autoconfig
command is issued on the Switch, it generates
and global and subnet information advertised from the router. This is a routable global IP address.
1.
In IPv6, all network interfaces can be associated with several addresses.
78
Subnet ID
16 bits
00
: 13
: 49
: 12
02
: 13
: 49
: FF
: FE
Interface ID
and EUI-64) to form a complete IPv6 address.
Interface ID
64 bits
: 34
: 56
: 12
: 34
: 56
1
another address which combines its interface ID
VES1724-56 User's Guide
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