Dhcp Relay Agent Information; Configuring Dhcp Global Relay - ZyXEL Communications MES3500 Series User Manual

36.3.1 DHCP Relay Agent Information

The Switch 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 Switch
relays to a DHCP server.
Relay Agent Information can include the System Name of the Switch if you select this option.
You can change the System Name in Basic Settings > General Setup.
The following describes the DHCP relay information that the Switch sends to the DHCP server:
Table 115 Relay Agent Information
FIELD LABELS
Slot ID
Port ID
VLAN ID
Information

36.3.2 Configuring DHCP Global Relay

Configure global DHCP relay in the DHCP Relay screen. Click IP Application > DHCP in the
navigation panel and click the Global link to display the screen as shown.
Figure 166 IP Application > DHCP > Global
The following table describes the labels in this screen.
Table 116 IP Application > DHCP > Global
LABEL
Active
Remote DHCP
Server 1 .. 3
Chapter 36 DHCP
DESCRIPTION
(1 byte) This value is always 0 for stand-alone switches.
(1 byte) This is the port that the DHCP client is connected to.
(2 bytes) This is the VLAN that the port belongs to.
(up to 64 bytes) This optional, read-only field is set according to system name set in Basic
Settings > General Setup.
DESCRIPTION
Select this check box to enable DHCP relay.
Enter the IP address of a DHCP server in dotted decimal notation.
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