3Com 2928 User Guide - Page 326

Configuring DHCP Snooping Functions on an Interface Select Network > DHCP from the navigation tree, and then click the DHCP Snooping tab to enter the page shown in Figure 3-3. You can view trusted and untrusted ports in the Interface Config field. Click the icon of a specific interface to enter the page shown in Figure 3-4. Figure 3-4 DHCP snooping interface configuration page Table 3-2 describes DHCP snooping interface configuration items. Table 3-2 DHCP snooping interface configuration items Item Interface Name Interface State Option 82 Support Option 82 Strategy Description This field displays the name of a specific interface. Configure the interface as trusted or untrusted. Configure DHCP snooping to support Option 82 or not. Select the handling strategy for DHCP requests containing Option 82. The strategies include: z Drop: The message is discarded if it contains Option 82. z Keep: The message is forwarded without its Option 82 being changed. z Replace: The message is forwarded after its original Option 82 is replaced with the Option 82 padded in normal format. Return to DHCP Snooping Configuration Task List. Displaying Clients' IP-to-MAC Bindings Select Network > DHCP from the navigation tree, and then click the DHCP Snooping tab to enter the page shown in Figure 3-3. Click the User Information button to view clients' IP-to-MAC bindings recorded by DHCP snooping, as shown in Figure 3-5. Figure 3-5 DHCP snooping user information Table 3-3 describes DHCP snooping user information configuration items. 3-5