D-Link DGS-1510-20 User Manual - Page 181
Command Mode, Command Default Level, Usage Guideline, Example, 3 ip dhcp snooping database,
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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline The DHCP snooping function validates the DHCP packets when it arrives at the port on the VLAN that is enabled for DHCP snooping. By default, the validation process will drop the packet if the gateway address is not equal to 0 or Option 82 is present. Use this command to allow packets with the relay Option 82 arriving at the untrusted interface. Example This example shows how to enable DHCP snooping for Option 82 to allow untrusted ports. Switch# configure terminal Switch(config)# ip dhcp snooping information option allow-untrusted Switch(config)# 18-3 ip dhcp snooping database This command is used to configure the storing of DHCP snooping binding entries to the local flash or a remote site. Use the no command to disable the storing or reset the parameters to the default setting. ip dhcp snooping database {URL | write-delay SECONDS} no ip dhcp snooping database [write-delay] Parameters URL write-delay SECONDS Specifies the URL in one of the following forms: • tftp://location/filename NOTE: The flash option only includes the external memory (like CF/SD/USB storage). Specifies the time delay to write the entries after a change is seen in the binding entry. The default is 300 seconds. The range is from 60 to 86400. Default By default, the URL for the database agent is not defined. The write delay value is set to 300 seconds. Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline Use this command to store the DHCP binding entry to local flash or remote server. Use the follow methods to store DHCP binding entries: • tftp: Store the entries to remote site via TFTP. 178
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