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id is assigned and the mechanisms used to configure it are outside

the scope of this memo.

4. DHCPv6 Server Behavior

This option provides additional information to the DHCPv6 server.

The DHCPv6 server may use this information, if available, in

addition

to other relay agent option data, other options included in the

DHCPv6 client messages, and physical network topology information

order to assign IP addresses, delegate prefixes, and/or other

configuration parameters to the client. There is no special

additional processing for this option.

There is no requirement that a server return this option and its

data

in a RELAY-REPLY message.

Volz Standards Track [Page

RFC 4580 Relay Agent Subscriber-ID June

2006

5. Security Considerations

As the subscriber-id option is only exchanged between relay agents

and DHCPv6 servers, [1], Section 21.1, provides details on

securing

DHCPv6 messages sent between servers and relay agents. [1],

Section

23, provides general DHCPv6 security considerations.

6. IANA Considerations

IANA has assigned a DHCPv6 option code (38) for the Relay Agent

Subscriber-ID Option.

7. Acknowledgements

Thanks to Richard Johnson, Theyn Palaniappan, and Mark Stapp as

this

document is essentially an edited version of their memo [3].

8. References

8.1. Normative References

[1] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and

Carney, "Dynamic Host Configuration Protocol for IPv6

(DHCPv6)",

RFC 3315, July 2003.

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