Zyxel OLT2412 [216/326] Dhcp relay agent information

Zyxel OLT2412 [216/326] Dhcp relay agent information
Chapter 29 DHCP
OLT2412 User’s Guide
216
(such as the IP address and subnet mask) between a DHCP client and a DHCP server. Once the
DHCP client obtains an IP address and can connect to the network, network information renewal is
done between the DHCP client and the DHCP server without the help of the OLT.
The OLT can be configured as a global DHCP relay. This means that the OLT forwards all DHCP
requests from all domains to the same DHCP server. You can also configure the OLT to relay DHCP
information based on the VLAN membership of the DHCP clients.
29.2.1 DHCP Relay Agent Information
The OLT can add information about the source of client DHCP requests that it relays to a DHCP
server by adding Relay Agent Information. This helps provide authentication about the source of
the requests. The DHCP server can then provide an IP address based on this information. Please
refer to RFC 3046 for more details.
The DHCP Relay Agent Information feature adds an Agent Information field to the Option 82
field. The Option 82 field is in the DHCP headers of client DHCP request frames that the OLT relays
to a DHCP server.
Relay Agent Information can include the system name of the OLT. See Section 7.1 on page 67
for how to change the system name.
The following describes the DHCP relay information that the OLT sends to the DHCP server:
29.3 DHCP Commands
Use these commands to configure DHCP features on the OLT.
•Use the dhcp relay commands to configure DHCP relay for specific VLAN.
•Use the dhcp smart-relay commands to configure DHCP relay for all broadcast domains.
•Use the dhcp server commands to configure the OLT as a DHCP server. (This command is
available on a layer 3 switch only.)
Table 116 Relay Agent Information
FIELD LABELS DESCRIPTION
Slot ID (1 byte) This is the slot that the DHCP client is connected to.
Port ID (1 byte) This is the port that the DHCP client is connected to.
VLAN ID (2 bytes) This is the VLAN that the port belongs to.
Information (up to 64 bytes) This optional, read-only field is set according to system
name set in Basic Settings > General Setup.

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