HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 60

Figure 22 DHCP relay agent operation DHCP relay agent support for Option 82 Option 82 records the location information about the DHCP client. It enables the administrator to locate the DHCP client for security and accounting purposes, and to assign IP addresses in a specific range to clients. For more information, see "Relay agent option (Option 82)." If the DHCP relay agent supports Option 82, it handles DHCP requests by following the strategies described in Table 3. If a response returned by the DHCP server contains Option 82, the DHCP relay agent removes the Option 82 before forwarding the response to the client. Table 3 Handling strategies of the DHCP relay agent If a DHCP request has... Option 82 Handling strategy Drop Keep Replace No Option 82 N/A The DHCP relay agent... Drops the message. Forwards the message without changing Option 82. Forwards the message after replacing the original Option 82 with the Option 82 padded according to the configured padding format, padding content, and code type. Forwards the message after adding Option 82 padded according to the configured padding format, padding content, and code type. DHCP relay agent configuration task list Tasks at a glance (Required.) Enabling DHCP (Required.) Enabling the DHCP relay agent on an interface (Required.) Specifying DHCP servers on a relay agent (Optional.) Configuring the DHCP relay agent security functions 51