D-Link DGS-3120-24PC-EI Product Manual - Page 218

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide MAC-port binding configuration set on the Switch. The default is Disabled. DHCP Snooping State Click the radio buttons to enable or disable DHCP snooping for IP-MAC-port binding. The default is Disabled. Recover Learning Ports Enter the port numbers used to recover the learning port state. Tick the All check box to apply to all ports. Click the Apply button to accept the changes made for each individual section. IMPB Port Settings Select a port or a range of ports with the From Port and To Port fields. Enable or disable the port with the State, Allow Zero IP and Forward DHCP Packet field, and configure the port's Max Entry. To view this window, click Security > IP-MAC-Port Binding (IMPB) > IMPB Port Settings as shown below: Figure 8-20 IMPB Port Settings window The fields that can be configured are described below: Parameter Description Unit From Port / To Port ARP Inspection IP Inspection Select the unit you want to configure. Select a range of ports to set for IP-MAC-port binding. When the ARP inspection function is enabled, the legal ARP packets are forwarded, while the illegal packets are dropped. Disabled - Disable the ARP inspection function. Enabled (Strict) - This mode disables hardware learning of the MAC address. All packets are dropped by default until a legal ARP or IP packets are detected. When enabling this mode, the Switch stops writing dropped FDB entries on these ports. If detecting legal packets, the Switch needs to write forward FDB entry. Enabled (Loose) - In this mode, all packets are forwarded by default until an illegal ARP packet is detected. The default value is Disabled. When both ARP and IP inspections are enabled, all IP packets are checked. The 210