User Manual

24-Port Gigabit (Hi-Power) PoE+ Ethernet Smart Managed Pro Switch with 2 SFP Ports
Configure System Information User Manual121
• LAG. Only LAGs are displayed.
• All. Both physical interfaces and LAGs are displayed.
8. Select
one or more interfaces by taking one of the following actions:
• To configure a single interface, select the check box associated with the port, or type
the port number in the
Go To Interface field and click the Go button.
• To configure multiple interfaces with the same settings, select the check box
associated with each interface.
• To configure all interfaces with the same settings, select the check box in the heading
row
.
9. From the T
rust Mode menu, select the desired trust mode:
• Disabled. The interface is considered to be untrusted and could potenti
ally be used
to launch a network attack. DHCP server messages are checked against the bindings
database. On untrusted ports, DHCP snooping enforces the following security rules:
- DHCP packets from a DHCP server (DHCPOFFER, DHCPACK, DHCPNAK,
DHCPRELEASEQUER
Y) are dropped.
- DHCPRELEASE and
DHCPDECLINE messages are dropped if the MAC address
is in the snooping database but the binding’s interface is other than the interface
where the message was received.
- DHCP packets are dropped when the source MAC address does not match the
client hardware address if MAC address validation is globally enabled.
• Enabled. The interface is considered to be trusted and forwards DHCP s
erver
messages without validation.
10. From the Invalid
Packets menu, select the packet logging mode.
When enabled, the DHCP snooping feature generates a log message when an invalid
packet is received and dropped by the interface.
11. In the Rate
Limit (pps) field, specify the rate limit value for DHCP snooping purposes.
The range is from 0 to 300. If the incoming rate of DHCP packets per
second exceeds the
configured burst interval per second, the port shuts down. If the rate limit value is None,
the burst interval is also nonapplicable, and rate limiting is disabled.
12. In the Burst
Interval (secs) field, specify the burst interval value for rate limiting purposes
on the interface.
The range is from 1 to 15. If the rate limit is N/A, then the burst interval is also
nonapplicable, and the field displays N/A.
13. Click the Apply
button.
Your settings are saved.
Configure static DHCP bindings
You can view, add, and remove static bindings in the DHCP snooping bindings database and
view or clear the dynamic bindings in the bindings table.