addresses, prefixes, DNS configuration, trigger accounting, etc.
This option is de-coupled from the access network's physical
structure, so a subscriber that moves from one access-point to
another, for example, would not require reconfiguration at the
service provider's DHCPv6 servers.
The subscriber-id information is only intended for use within a
single administrative domain and is only exchanged between the
relay
agents and DHCPv6 servers within that domain. Therefore, the
format
and encoding of the data in the option is not standardized, and
this
specification does not establish any semantic requirements on the
data. This specification only defines the option for conveying
this
information from relay agents to DHCPv6 servers.
Volz Standards Track [Page
2]
RFC 4580 Relay Agent Subscriber-ID June
2006
However, as the DHCPv4 Subscriber-ID suboption [3] specifies
Network
Virtual Terminal (NVT) American Standard Code for Information
Interchange (ASCII) [4] encoded data, in environments where both
DHCPv4 [5] and DHCPv6 are being used, it may be beneficial to use
that encoding.
The format of the DHCPv6 Relay Agent Subscriber-ID option is shown
below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_SUBSCRIBER_ID | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. subscriber-id .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code OPTION_SUBSCRIBER_ID (38)
option-len length, in octets, of the subscriber-id field.
The minimum length is 1 octet.
subscriber-id The subscriber's identity.
3. DHCPv6 Relay Agent Behavior
DHCPv6 relay agents may be configured to include a Subscriber-ID
option in relayed (RELAY-FORW) DHCPv6 messages. How the
subscriber-
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