3Com 2928 User Guide - Page 314
DHCP Relay Agent Configuration Task List, Remarks
UPC - 662705557113
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Figure 2-2 DHCP relay agent work process As shown in Figure 2-2, the DHCP relay agent works as follows: 1) After receiving a DHCP-DISCOVER or DHCP-REQUEST broadcast message from a DHCP client, the DHCP relay agent fills the giaddr field of the message with its IP address and forwards the message to the designated DHCP server in unicast mode. 2) Based on the giaddr field, the DHCP server returns an IP address and other configuration parameters to the relay agent, which conveys them to the client. DHCP Relay Agent Configuration Task List Complete the following tasks to configure the DHCP relay agent: Task Enabling DHCP and Configuring Advanced Parameters for the DHCP Relay Agent Creating a DHCP Server Group Enabling the DHCP Relay Agent on an Interface Remarks Required Enable DHCP globally and configure advanced DHCP parameters. By default, global DHCP is disabled. Required To improve reliability, you can specify several DHCP servers as a group on the DHCP relay agent and correlate a relay agent interface with the server group. When the interface receives requesting messages from clients, the relay agent will forward them to all the DHCP servers of the group. Required Enable the DHCP relay agent on an interface, and correlate the interface with a DHCP server group. With DHCP enabled, interfaces work in the DHCP server mode by default. z You can enable either the DHCP server or the DHCP relay agent on an interface. The latest configuration takes effect. z The DHCP relay agent works on interfaces with IP addresses manually configured only. 2-2
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