3Com Switch 7750 Configuration Guide

614 CHAPTER 58: DHCP RELAY AGENT CONFIGURATION
Enabling DHCP Make sure to enable DHCP before you perform other DHCP relay agent-related
configurations, since other DHCP-related configurations cannot take effect with
DHCP disabled.
Configuring an Interface
to Operate in DHCP
Relay Agent Mode
When an interface operates in the relay mode, the interface forwards the DHCP
packets received from DHCP clients to an external DHCP server, which assigns IP
addresses to the DHCP clients.
To enhance reliability, you can set multiple DHCP servers on the same network.
These DHCP servers form a DHCP server group. When the interface establishes
mapping relationship with the DHCP server group, the interface forwards the
DHCP packets to all servers in the server group.
Configure a DHCP relay agent to broadcast
responses to clients
Optional “Configuring a
DHCP Relay Agent
to Broadcast
Responses to
Clients” on page
615
Specify gateways for DHCP clients Optional “Specifying
Gateways for DHCP
Clients” on page
615
Specify source IP address of uplink packets Optional “Specifying the
Source IP Address
of Uplink Packets”
on page 616
Configure DHCP relay agent security functions Optional “Configuring DHCP
Relay Agent
Security Functions”
on page 617
Configure Option 82 support Optional “Configuring
Option 82 Support”
on page 619
Table 481 DHCP relay agent configuration tasks
Configuration task Description Related section
Table 482 Enable DHCP
Operation Command Description
Enter system view system-view -
Enable DHCP dhcp enable Required
By default, DHCP is enabled
Table 483 Configure an interface to operate in DHCP relay agent mode
Operation Command Description
Enter system view system-view -
Configure the DHCP server IP
address(es) in a specified
DHCP server group
dhcp-server groupNo ip
ip-address&<1-8>
Required
By default, no DHCP server IP
address is configured in a
DHCP server group