OLT LTP-16N, LTP-16NT. User Manual
47
•
•
•
•
4.7 DHCP Configuration
4.7.1 Introduction
This section describes the procedure for operating the terminal with the DHCP. The operation of the protocol
can be divided into two blocks:
DHCP snooping. Used to intercept DHCP traffic, control and monitor sessions.
DHCP opt82. Functionality to insert service option 82 in DHCP packets.
4.7.2 DHCP snooping
This functionality is used to intercept and process traffic on the terminal CPU.
Currently, this functionality must be enabled if you want to control and monitor DHCP sessions and to operate
with option 82 in DHCP packets.
4.7.2.1
DHCP snooping enabling
Step 1.
The global
snooping
configuration is performed in the
ip dhcp
view
, section
configure view
.
LTP-16N# configure terminal
LTP-16N(configure)# ip dhcp
LTP-16N(config)(dhcp)#
Step 2.
Enable DHCP snooping using the
snooping enable
command.
LTP-16N(config)(dhcp)# snooping enable
4.7.3 DHCP option 82
DHCP opt82 is used to provide a DHCP server with additional information about a received DHCP request. This
may include information about the terminal running DHCP opt82 as well as information about the ONT, which
sent the DHCP request. DHCP packets are modified by interception and further processing in the terminal CPU,
i.e. DHCP snooping must be enabled.
The DHCP server analyses DHCP option 82 and identifies the ONT. Terminal allows the option to be both
transparently transmitted from the ONT and formed/rewritten according to a specified format. DHCP option 82
is especially useful for networks, which have no private VLANs dedicated for each user.
DHCP opt82 supports configurable formats for both Circuit ID and Remote ID. The format of the suboptions is
configured with the help of the tokens listed in Table 15. The placeholders will be replaced with corresponding
values, while the rest of the words will be passed as is.
Table 15 – List of tokens for configuring the DHCP option 82 suboption format
Token
Description
%HOSTNAME%
Terminal network name
%MNGIP%
Terminal IP address