H3C Technologies H3C S12500 Series Switches - Manual (Page 146)

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Figure 54 IPv6 prefix assignment
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Concepts
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Multicast addresses used by DHCPv6
DHCPv6 uses the multicast address FF05::1:3 to identify all site-local DHCPv6 servers, and uses the
multicast address FF02::1:2 to identify all link-local DHCPv6 servers and relay agents.
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DUID
A DHCP unique identifier (DUID) uniquely identifies a DHCPv6 device (DHCPv6 client, server, or relay
agent). A DHCPv6 device adds its DUID in a sent packet.
Figure 55 DUID-LL format
The device supports the DUID format based on link-layer address (DUID-LL) defined in RFC 3315.
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Figure
55 shows the DUID-LL format, where:
• DUID type—The device supports the DUID type of DUID-LL with the value of 0x0003.
• Hardware type—The device supports the hardware type of Ethernet with the value of 0x0001.
• Link layer address—Takes the value of the bridge MAC address of the device.
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IA
Identified by an IAID, an identity association (IA) provides a construct through which a client manages
the obtained addresses, prefixes, and other configuration parameters. A client can have multiple IAs, for
example, one for each of its interfaces.
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IAID
An IAID uniquely identifies an IA. It is chosen by the client and must be unique on the client.