ZyXEL Communications XS3800-28, User Manual, Page: 468 / 789

Chapter 64 DHCP
XS3800-28 User’s Guide
468
DHCP Modes
The Switch can be configured as a DHCP server or DHCP relay agent.
• If you configure the Switch as a DHCP server, it will maintain the pool of IP addresses along with
subnet masks or prefixes, DNS server and default gateway information and distribute them to your
LAN computers.
• If there is already a DHCP server on your network, then you can configure the Switch as a DHCP relay
agent. When the Switch receives a request from a computer on your network, it contacts the DHCP
server for the necessary IP information, and then relays the assigned information back to the
computer.
DHCPv4 Configuration Options
The DHCPv4 configuration on the Switch is divided into Smart Relay and VLAN screens. The screen you
should use for configuration depends on the DHCP services you want to offer the DHCP clients on your
network. Choose the configuration screen based on the following criteria:
• Smart Relay
–
The Switch forwards all DHCP requests to the same DHCP server.
• VLAN
–
The Switch is configured on a VLAN by VLAN basis. The Switch can be configured as a DHCP
server for one VLAN and at the same time the Switch can be configured to relay DHCPv4 requests for
clients in another VLAN.
64.2 DHCPv4 Relay Status
Click NETWORKING > DHCP > DHCPv4 Relay in the navigation panel. The DHCP Relay Status screen
displays.
Figure 361 NETWORKING > DHCP > DHCPv4 Relay > DHCP Relay Status
The following table describes the labels in this screen.
Table 234 NETWORKING > DHCP > DHCPv4 Relay > DHCP Relay Status
LABEL DESCRIPTION
Relay
Mode
This field displays:
None – if the Switch is not configured as a DHCP relay agent.
Smart – if the Switch is configured as a DHCP relay agent only.
VLAN – followed by a VLAN ID or multiple VLAN IDs if it is configured as a relay agent for specific
VLANs.