ZyXEL Communications GS-2750 - Manual (Page 236)

Chapter 29 DHCP
GS-2750 User’s Guide
236
The Switch can be configured as a global DHCP relay. This means that the Switch forwards all
DHCP requests from all domains to the same DHCP server. You can also configure the Switch
to relay DHCP information based on the VLAN membership of the DHCP clients.
29.4.1 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:
29.4.2 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 124 IP Application > DHCP > Global
Table 90 Relay Agent Information
FIELD LABELS DESCRIPTION
Slot ID (1 byte) This value is always 0 for stand-alone switches.
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.