ZyXEL VES1724-56B2 User Guide - Page 78

Unspecified, EUI-64, Stateless Autoconfiguration

Page 78 highlights

Chapter 8 Basic Setting Table 14 Global Address Format 001 3 bits Global ID 45 bits Subnet ID 16 bits Interface ID 64 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 (6byte) 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 00 : 13 : 49 : 12 : 34 : 56 EUI-64 02 : 13 : 49 : FF : FE : 12 : 34 : 56 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 Interface ID and EUI-64) to form a complete IPv6 address. 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 1another address which combines its interface ID 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 VES1724-56 User's Guide

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Chapter 8 Basic Setting
VES1724-56 User’s Guide
78
Table 14
Global Address Format
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.
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
Interface ID
and
EUI-64
) to form a complete IPv6 address.
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
1
another address which combines its interface ID
and global and subnet information advertised from the router. This is a routable global IP address.
001
Global ID
Subnet ID
Interface ID
3 bits
45 bits
16 bits
64 bits
MAC
00
: 13
: 49
: 12
: 34
: 56
EUI-64
0
2
: 13
: 49
:
FF
:
FE
: 12
: 34
: 56
1.
In IPv6, all network interfaces can be associated with several addresses.