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**DHCPv6 Prefix Delegation (PD)**
VyOS 1.3 (equuleus) supports DHCPv6-PD (:rfc:`3633`). DHCPv6 Prefix Delegation
is supported by most ISPs who provide native IPv6 for consumers on fixed networks.
.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> length <length>
Some ISPs by default only delegate a /64 prefix. To request for a specific
prefix size use this option to request for a bigger delegation for this pd
`<id>`. This value is in the range from 32 - 64 so you could request up to a
/32 prefix (if your ISP allows this) down to a /64 delegation.
The default value corresponds to 64.
Example:
To request a /56 prefix from your ISP use:
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} dhcpv6-options pd 0 length 56
.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> interface <delegatee> address <address>
Specify the interface address used locally on the interfcae where the prefix
has been delegated to. ID must be a decimal integer.
It will be combined with the delegated prefix and the sla-id to form a
complete interface address. The default is to use the EUI-64 address of the
interface.
Example: Delegate a /64 prefix to interface eth0.10 which will use a local
address on this router of ``<prefix>::ffff``, as the address 65534 will
correspond to ``ffff`` in hexadecimal notation.
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} dhcpv6-option pd 0 interface eth0.10 address 65534
.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> interface <delegatee> sla-id <id>
Specify the identifier value of the site-level aggregator (SLA) on the
interface. ID must be a decimal number greater then 0 which fits in the
length of SLA IDs (see below).
Example: If ID is 1 and the client is delegated an IPv6 prefix
2001:db8:ffff::/48, dhcp6c will combine the two values into a single IPv6
prefix, 2001:db8:ffff:1::/64, and will configure the prefix on the specified
interface.
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} dhcpv6-option pd 0 interface eth0.10 sla-id 1
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