Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1746)

DHCP for IPv6 (DHCPv6) Introduction and Configuration
Software Reference for x310 Series Switches
65.10 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
DHCPv6 Client and Server Identification
DHCPv6 Clients and Servers are identified by a DHCPv6 Unique Identifier (DUID). The DUID
consists of a number, followed by a hexadecimal string that identifies the hardware type
of the client and the link-layer address of the client.
DHCPv6 Unique Identifier (DUID)
A DUID identifies each DHCPv6 Client and Server, where Client and Server identifier
options contain the DUID. The DUID is unique for DHCPv6 Clients and Servers. DHCPv6
uses DUIDs with link-layer addresses for client and server identifiers. The device uses the
MAC address from the lowest-numbered interface to determine a DUID.
Prefixes are considered to be for different clients when a DHCPv6 Client requests two
prefixes with the same DUID and with different IAIDs on different network interfaces.
Identity Associations (IAID, and IANA)
DHCPv6 Clients use identity associations to identify each interface that is configured by
DHCPv6. An interface’s identity association contains the configuration settings of the
interface and an Identity Association Identifier (IAID). When the client requests settings
from the server for a particular interface, it includes the IAID, to identify the interface.
IAIDs are consistent after reloading using information from the associated interface that is
permanently attached to the device.