xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
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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
Select the unit you want to configure.
From Port / To Port
Select a range of ports to set for IP-MAC-port binding.
ARP Inspection
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.
IP Inspection
When both ARP and IP inspections are enabled, all IP packets are checked. The
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