HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 153
Concepts, Multicast addresses used by DHCPv6, DUID, IA, IAID
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Figure 63 IPv6 prefix assignment Concepts 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. 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 64 DUID-LL format IA IAID The device supports the DUID format based on link-layer address (DUID-LL) defined in RFC 3315. Figure 64 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. 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. An IAID uniquely identifies an IA. It is chosen by the client and must be unique on the client. 145
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