ZyXEL MGS-3712F User Guide - Page 247
Table 77
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Chapter 26 IP Source Guard The following table describes the labels in this screen. Table 77 DHCP Snooping Configure LABEL DESCRIPTION Active Select this to enable DHCP snooping on the Switch. You still have to enable DHCP snooping on specific VLAN and specify trusted ports. DHCP Vlan Note: If DHCP is enabled and there are no trusted ports, DHCP requests will not succeed. Select a VLAN ID if you want the Switch to forward DHCP packets to DHCP servers on a specific VLAN. Note: You have to enable DHCP snooping on the DHCP VLAN too. Database Agent URL Timeout interval Write delay interval Renew DHCP Snooping URL You can enable Option82 in the DHCP Snooping VLAN Configure screen (Section 26.5.2 on page 249) to help the DHCP servers distinguish between DHCP requests from different VLAN. Select Disable if you do not want the Switch to forward DHCP packets to a specific VLAN. If Timeout interval is greater than Write delay interval, it is possible that the next update is scheduled to occur before the current update has finished successfully or timed out. In this case, the Switch waits to start the next update until it completes the current one. Enter the location of the DHCP snooping database. The location should be expressed like this: tftp://{domain name or IP address}/directory, if applicable/file name; for example, tftp://192.168.10.1/database.txt. Enter how long (10-65535 seconds) the Switch tries to complete a specific update in the DHCP snooping database before it gives up. Enter how long (10-65535 seconds) the Switch waits to update the DHCP snooping database the first time the current bindings change after an update. Once the next update is scheduled, additional changes in current bindings are automatically included in the next update. Enter the location of a DHCP snooping database, and click Renew if you want the Switch to load it. You can use this to load dynamic bindings from a different DHCP snooping database than the one specified in Agent URL. When the Switch loads dynamic bindings from a DHCP snooping database, it does not discard the current dynamic bindings first. If there is a conflict, the Switch keeps the dynamic binding in volatile memory and updates the Binding collisions counter in the DHCP Snooping screen (Section 26.4 on page 243). MGS-3712/MGS-3712F User's Guide 247