User Manual

Configure System Information
91
Insight Managed 8-Port Gigabit Ethernet Smart Cloud Switch with 2 SFP Fiber Ports
5. Select System> Services > DHCP Snooping > Interface Configuration.
The DHCP Snooping Interface Configuration page displays.
6. To display information for all ports and LAGs, click the All link.
7. 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.
8. From the Trust Mode menu, select the desired trust mode:
• Disabled. The interface is considered to be untrusted and could potentially 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,
DHCPRELEASEQUERY) 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 server
messages without validation.
9. 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.
10. In the Rate Limit(pps) field, specify the rate limit value for DHCP snooping purposes.
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 N/A, then the burst interval is
also nonapplicable, and rate limiting is disabled.
11. In the Burst Interval(secs) field, specify the burst interval value for rate limiting purposes on
this interface.
If the rate limit is N/A, then the burst interval is also nonapplicable, and the field displays
N/A.
12. 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
to view or clear the dynamic bindings in the bindings table.