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Chapter 51 DHCP
XMG1915 Series User’s Guide
290
CHAPTER 51
DHCP
51.1 DHCP Overview
This chapter shows you how to configure the DHCP feature.
DHCP (Dynamic Host Configuration Protocol RFC 2131 and RFC 2132) allows individual computers to
obtain TCP/IP configuration at start-up from a server. If you configure the Switch as a DHCP relay agent,
then the Switch forwards DHCP requests to DHCP server on your network. If you do not configure the
Switch as a DHCP relay agent then you must have a DHCP server in the broadcast domain of the client
computers or else the client computers must be configured manually.
51.1.1 What You Can Do
• Use the DHCPv4 Relay Status screen (Section 51.2 on page 291) to display the relay mode and status.
• Use the DHCPv4 Option 82 Profile screen (Section 51.4 on page 293) to create DHCPv4 option 82
profiles.
• Use the DHCPv4 Smart Relay screen (Section 51.5 on page 294) to configure global DHCPv4 relay.
You can also use this screen to apply different DHCP option 82 profile to certain ports on the Switch.
• Use the DHCPv4 Relay VLAN Setting screen (Section 51.6 on page 298) to configure your DHCPv4
settings based on the VLAN domain of the DHCPv4 clients. You can also use this screen to apply a
different DHCP option 82 profile to certain ports in a VLAN.
• Use the DHCPv6 Relay screen (Section 51.7 on page 301) to enable and configure DHCPv6 relay.
51.1.2 What You Need to Know
Read on for concepts on DHCP that can help you configure the screens in this chapter.
DHCP Modes
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.
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