D-Link DGS-3620-52P Web UI Reference Guide - Page 345
From Port / To Port, ARP Inspection, Protocol, Zero IP, DHCP Packet, Stop Learning, Threshold, xStack
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xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide Figure 8-19 IMPB Port Settings window The fields that can be configured are described below: Parameter Description From Port / To Port ARP Inspection IP Inspection Protocol Zero IP DHCP Packet Stop Learning Threshold 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 or broadcast IP packet is detected. The default value is Disabled. When both ARP and IP inspections are enabled, all IP packets are checked. The legal IP packets are forwarded, while the illegal IP packets are dropped. When IP Inspection is enabled, and ARP Inspection is disabled, all non-IP packets (Ex. L2 packets, or ARP) are forwarded by default. The default value is Disabled. Use the drop-down menu to select the protocol types, IPv4, IPv6 or All. Use the drop-down menu to enable or disable this feature. Allow zero IP configures the state which allows ARP packets with 0.0.0.0 source IP to bypass. By default, the DHCP packet with broadcast DA will be flooded. When set to disable, the broadcast DHCP packet received by the specified port will not be forwarded in strict mode. This setting is effective when DHCP snooping is enabled, in the case when a DHCP packet which has been trapped by the CPU needs to be forwarded by the software. This setting controls the forwarding behavior in this situation. Here is displayed the number of blocked entries on the port. The default value is 500. 335