ELTEX LTP-4X, Operation Manual

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It also protects from illegal DHCP servers by controlling the source IP address of DHCP responses.
Transmitted are only the DHCP responses, which arrived from IP addresses of trusted DHCP servers.
22.1 DHCP Relay Agent Profiles Management
A set of profiles is used for DHCP Relay Agent configuration. All VLANs use profile 0 by default.
The configuration is flexible as it allows DHCP profiles to be assigned not only to a terminal on the whole,
but separately to each VLAN as well. To assign a profile, the following steps should be taken.
Step 1. Assign the default profile for all VLANs with the help of the gpon olt profile dhcpra add dhcp-ra-
00 command.
LTP-8X# configure terminal
LTP-8X(config)# gpon olt profile dhcpra dhcp-ra-00
Step 2. Create a new DHCP Relay Agent profile with the help of the profile dhcp-ra command if necessary.
Pass profile name as a parameter.
LTP-8X(config)# profile dhcp-ra dhcp-ra-01
LTP-8X(config-dhcp-ra)("dhcp-ra-01")# exit
Step 3. Assign the newly created profile to a selected VLAN with the gpon olt profile dhcpra dhcp-ra-01
command. As a parameter, pass the VID, which requires individual configuration.
LTP-8X(config)# gpon olt profile dhcpra dhcp-ra-01 vid 1000
Step 4. Check the changes by using the show gpon olt configuration command.
LTP-8X(config)# do show gpon olt configuration
...
Profile dhcp-ra: dhcp-ra-00 OLT Profile DHCP Relay Agent 0
Profile dhcp-ra per VLAN 1000
[0]:dfdffd111000redefinition [0]:
Profile: dhcp-ra-01 OLT Profile DHCP Relay Agent 1
..
Step 5. Apply the changes by using the commit command.
LTP-8X(config)# do commit
To apply the changes, the OLT should be reconfigured.