Configuration Guide Configuring DHCPv6
DUID Based on Link-Layer address plus Time (DUID-LLT).
DUID Assigned by Vendor Based on Enterprise Number (DUID-EN).
Link-Layer address (DUID-LL).
Ruijie DHCPv6 devices use DUID-LLs. The structure of a DUID-LL is as follows:
The values of DUID-LL, Hardware type, and Link-layer address are 0x0003, 0x0001 (indicating the Ethernet), and MAC
address of a device respectively.
Identity Association (IA)
A DHCPv6 server allocates IAs to DHCPv6 clients. Each IA is uniquely identified by an identity association identifier (IAID).
IAIDs are generated by DHCPv6 clients. A one-to-one mapping is established between IAs and clients. An IA may contain
several addresses, which can be allocated by the client to other interfaces. An IA may contain one of the following types of
addresses:
Non-temporary Addresses (NAs), namely, globally unique addresses.
Temporary Addresses (TAs), which are hardly used.
Prefix Delegation (PD).
Based on the address type, IAs are classified into IA_NA, IA_TA, and IA_PD (three IA-Types). Ruijie DHCPv6 servers
support only IA_NA and IA_PD.
Binding
A DHCPv6 binding is a manageable address information structure. The address binding data on a DHCPv6 server records
the IA and other configurations of every client. A client can request multiple bindings. The address binding data on a server is
present in the form of an address binding table with DUID, IA-Type and IAID as the indexes. A binding containing
configurations uses DUID as the index.
DHCPv6 Conflict
When an address allocated by a DHCPv6 client is in conflict, the client sends a Decline packet to notify the DHCPv6 server
that the address is rebound. Then, the server adds the address to the address conflict queue. The server will not allocate the
addresses in the address conflict queue. The server supports viewing and clearing of address information in the address
conflict queue.
Packet Type
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