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LTP-8X optical line terminal
Chapter 17.
DHCP Relay Agent Configuration
Introduction
This Chapter describes configuration of DHCP Relay Agent in the terminal.
DHCP Relay Agent is used to provide a DHCP server with additional information about a received DHCP
request. This may include information about the terminal running DHCP Relay Agent as well as
information about
THE
ONT which sent the DHCP request. DHCP packets are modified by interception
and further processing in terminal CPU.
The DHCP server analyses DHCP option 82 and identifies the ONT. DHCP Relay Agent allows the option
to be both transparently transmitted from ONT as well as formed and rewritten according to a specified
format. DHCP option 82 is especially useful for a network which has no private VLANs dedicated for each
user.
DHCP Relay Agent supports configurable formats for both Circuit ID and Remote ID. The suboptions
format is configured with the help of the tokens listed in Table 17.1. The placeholders will be replaced
with corresponding values, while the rest of the words will be passed as is.
Table 17.1. DHCP Option 82 Tokens
%HOSTNAME%
The terminal network name
%MNGIP%
The terminal IP address
%GPON-PORT%
ID of the OLT channel the DHCP request arrived from
%ONTID%
ID of the ONT which sent the DHCP request
%PONSERIAL%
Serial number of the ONT which sent the DHCP request
%GEMID%
ID of the GEM port where the DHCP request arrived
%VLAN0%
External VID
%VLAN1%
Internal VID
%MAC%
MAC address of the ONT which sent the request
%OPT60%
DHCP option 60 received from the ONT
%OPT82 CID%
Circuit ID received from the ONT
%OPT82 RID%
Remote ID received from the ONT
%DESCR%
ONT description
