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**DHCPv6 Prefix Delegation (PD)**
VyOS supports DHCPv6 Prefix Delegation (DHCPv6-PD) as described in :rfc:`3633`.
DHCPv6-PD is supported by most ISPs that provide native IPv6 for consumers on
fixed networks.
.. cfgcmd:: set interfaces {{ var0 }} <interface> {{ var2 }} {{ var3 }}
{{ var5 }} {{ var6 }} dhcpv6-options pd <id> length <length>
**Configure a specific prefix length for DHCPv6-PD requests on this
interface.**
Some ISPs provide only a /64 prefix by default. Use this command to
request a different prefix length for a specific DHCPv6-PD request,
ranging from /32 (if allowed by your ISP) down to /64. <id> is a
unique identifier for the DHCPv6-PD request.
The default value is 64.
To request a /56 prefix from your ISP, use:
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} {{ var2 }} {{ var4 }} {{ var5 }} {{ var7 }} dhcpv6-options pd 0 length 56
.. cfgcmd:: set interfaces {{ var0 }} <interface> {{ var2 }} {{ var3 }}
{{ var5 }} {{ var6 }} dhcpv6-options pd <id> interface <delegatee>
address <address>
**Configure the IPv6 interface identifier (host portion) for the delegatee
interface.**
The value must be a decimal integer. It is appended to the delegated prefix
and the configured :abbr:`SLA ID (Site-Level Aggregation ID)` to form the
final IPv6 address.
By default, the host portion is generated based on the parent interface's
MAC address (EUI-64 format).
.. stop_vyoslinter
**Example:**
If a /64 prefix is delegated to interface eth8 and you configure the host
portion as 65535, the resulting IPv6 address will end with ::ffff, as
65535 corresponds to ffff in hexadecimal notation.
.. start_vyoslinter
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} {{ var2 }} {{ var4 }} {{ var5 }} {{ var7 }} dhcpv6-options pd 0 interface eth8 address 65534
.. cfgcmd:: set interfaces {{ var0 }} <interface> {{ var2 }} {{ var3 }}
{{ var5 }} {{ var6 }} dhcpv6-options pd <id> interface <delegatee> sla-id <id>
**Configure the** :abbr:`SLA ID (Site-Level Aggregation ID)` **for the
delegatee interface.**
The value must be a decimal integer greater than 0 and fit in the length of
SLA IDs. It is converted to hexadecimal and appended to the delegated prefix
to form the specific subnet prefix for the delegatee interface.
**Example:**
If SLA ID is 1 and the delegated prefix is ``2001:db8:ffff::/48``, the
resulting subnet prefix for the delegatee interface will be
``2001:db8:ffff:1::/64``.
.. code-block:: none
set interfaces {{ var0 }} {{ var1 }} {{ var2 }} {{ var4 }} {{ var5 }} {{ var7 }} dhcpv6-options pd 0 interface eth8 sla-id 1
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