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Volz Standards Track [Page

RFC 4580 Relay Agent Subscriber-ID June

2006

1. Introduction

DHCPv6 [1] provides IP addresses and configuration information for

IPv6 clients. It includes a relay agent capability, in which

processes within the network infrastructure receive multicast

messages from clients and relay them to DHCPv6 servers. In some

network environments, it will be useful for the relay agent to add

information to the DHCPv6 message before relaying it.

The information that relay agents supply can also be used in the

server's decision-making about the addresses, delegated prefixes

[2],

and configuration parameters that the client is to receive.

In many service-provider environments, it is believed to be

desirable

to associate some provider-specific information with clients'

DHCPv6

messages that is independent of the physical network configuration

and that the relay agent has learned through some means that is

outside the scope of this memo.

2. The Relay Agent Subscriber-ID Option

In complex service provider environments, there is a need to

connect

a customer's DHCPv6 configuration with the customer's

administrative

information. The Relay Agent Subscriber-ID option carries a value

that can be independent of the physical network configuration

through

which the subscriber is connected. This value complements, and

might

well be used in addition to, the network-based information. The

"subscriber-id" assigned by the provider is intended to be stable

customers connect through different paths, and as network changes

occur.

The subscriber-id information allows the service provider to

assign/

activate subscriber-specific actions; e.g., assignment of specific

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