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Figure 2-9: OLT as a DHCP relay agent
OLT supported DHCP related software features:
Support the configuration of UNI interfaces as DHCP Trusted or Untrusted
Support changing the DHCP Broadcast flag of DHCP Discover and Request messages
2.8.3.1 DHCP Relay Agent Option 82
The OLT system provides DHCP Relay Agent feature by inserting/removing (inserting in the client => network direction and removing in the
network => client direction) of Option 82 in the DHCP packets. The Option 82 has the role to introduce client specific information in the requests
made to the DHCP servers. This information is added in two fields, Circuit ID and Remote ID.
The Circuit ID sub-option transports specific information of the circuit in question. In the case of the OLT system it identifies which is the ONT in
question by adding a string with the following format:
System_name eth board/pon/ont/ont_board/ont_port
The Remote ID sub-option transports client specific information, as for example, the service plan hired by the customer. This field is composed by
a string with 64 characters.
2.8.3.2 Lightweith DHCPv6 Relay Agent
Lightweight DHCPv6 Relay Agent is used to insert relay agent options in DHCPv6 message exchanges identifying client interfaces. The messages
received from the client interfaces of the following types will be discarded:
Advertise
Reply
Reconfigure
Relay-Reply
The other message types will be encapsulated in a Relay-Forward message towards the DHCP server. The Relay Forward Message will be composed
by the Relay-Message Option (9) which will encapsulate the client request, and optionally by the Interface-ID (18) Option and/or the Remote-ID
Option (37) which will add client information.
The DHCPv6 Relay Agent only accepts the following type of message from the server:
Relay-Reply
After receiving the Relay-Reply message from the server, the DHCPv6 Relay Agent extracts the information in the Relay-Message Option (9) and
forwards it to the corresponding client. At this point the Relay Agent Binding table is updated with the corresponding IPv6/MAC Address/Client/
Lease information.
Summary of Contents for OLT 769401
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