q-Tech OLT-QSW-9010, Cli Configuration Manual

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User Manual
9. Dhcp-relay service configuration 86
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9. DHCP-RELAY SERVICE CONFIGURATION
9.1. DHCPv4-Option60 / 82
The OLT DHCP v4 function does not do anything for the option60. After enabling the DHCP v4 relay
function, the DHCP message is transparently forwarded.
After enabling DHCP (Dynamic Host Configuration Protocol) Option 82 function, DHCP v4 L2 Relay
work process is as follows:
DHCP V4 client broadcast the request message when initializing.
DHCP v4 relay equipment will check whether there is option 82 in the message, and handle
accordingly. If Option 82 is there, the equipment will handle the message according to the
configuration of the strategy (Discard, Replace the option 82 with relay equipment itself or keep the
one in the original message), then forward the request message to DHCP v4 server. If
there is no
Option 82 in the request message, the DHCP v4 relay equipment will forward the message to DHCP V4
server after the Option 82 is added. So the request message will contain the ONU information that is
connected by the DHCP v4 client, the VLAN that belongs to, and the MAC address of the DHCP v4
relay equipment itself.
When the DHCP v4 server receives DHCP v4 request message forwarded by DHCP V4 relay equipent,
the message in Option 82 will be recorded, and send the message that is carried with DHCP V4
configuration and option82 information to DHCPv4 relay equipment.
After DHCPv4 relay equipment received the return message of the DHCPv4 server, it will strip Option
82 information in the message, and then forward the message with DHCPv4 configuration
information to the DHCPv4 client.
Configuration:
Enable OLT global DHCPv4 Relay Function:
OLT (config) # dhcp-relay information
Option82 configuration option to add location information field Configure the location information
adding field in the option82:
OLT (config) # dhcp-relay information access-node-id string xxxx
Configure ONU CID (circuit-id, which is used to describe line information for GPON and ONU
connections) and RID (remote-id, used to describe remote DHCP server information)in option82.
OLT (config) # interface gpon-onu1 / 1: 1
OLT (config-gpon-onu1 / 1: 1) # dhcp-relay infomation circuit-id
string 123456789
OLT (config-gpon-onu1 / 1: 1) # dhcp-relay infomation remote-id
string 123456789