D-Link DGS-3200-16 User Manual - Page 113
IMP Port Settings window, From Port/To Port
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xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch Figure 5 - 5. IMP Port Settings window The following fields can be set or modified: Parameter Description From Port/To Port Select a range of ports to set for IP-MAC-port binding. State Use the pull-down menu to enable or disable these ports for IP-MAC-port binding. Enabled (Strict) This mode provides a stricter method of control. If the user selects this mode, all packets will be sent to the CPU, thus all packets will not be forwarded by the hardware until the S/W learns the entries for the ports. The port will check ARP packets and IP packets by IP-MAC-port binding entries. When the packet is found by the entry, the MAC address will be set to dynamic state. If the packet is not found by the entry, the MAC address will be set to block. Other packets will be dropped. The default mode is strict if not specified. The ports with strict mode will capture unicast DHCP packets through the ACL module. If configuring IP-MAC-port binding in strict mode when IP-MAC-port binding DHCP snooping is enabled, it will create an ACL profile and the rules according to the ports. If there is not enough profile or rule space for an ACL profile or rule table, it will return a warning message and will not create an ACL profile and rules to capture unicast DHCP packets. Enabled (Loose) This mode provides a looser way of control. If the user selects loose mode, ARP packets and IP broadcast packets will be sent to the CPU. The packets will still be forwarded by the hardware until a specific source MAC address is blocked by the software. The port will check ARP packets and IP broadcast packets by IP-MAC-port binding entries. When the packet is found by the entry, the MAC address will be set to dynamic state. If the packet is not found by the entry, the MAC address will be set to block. Other packets will be bypassed. Allow Zero IP Use the pull-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. Forward DHCP Packet 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. Mode Toggle between ARP and ACL. When configuring the port mode to ACL, the Switch will create an ACL access entry corresponding to the entries of this port. If the port changes to ARP, all the ACL access entries will be deleted automatically. The default mode is ARP. Max Entry (1-50) Specifies the maximum number of DHCP snooping entries. By default, the per port maximum entry is 5. Click Apply to implement the settings made. 100