PLANET LRP-822CS - Manual (Page 243)

User’s Manual of LRP-822CS
243
4.9.7.4 Port Setting
Configures switch ports as trusted or untrusted.
Command Usage
 A trusted interface is an interface that is configured to receive only messages from within the network. An untrusted interface
is an interface that is configured to receive messages from outside the network or firewall.
 When DHCP snooping is enabled both globally and on a VLAN, DHCP packet filtering will be performed on any untrusted
ports within the VLAN.
 When an untrusted port is changed to a trusted port, all the dynamic DHCP snooping bindings associated with this port are
removed.
 Set all ports connected to DHCP servers within the local network or firewall to trusted state. Set all other ports outside the
local network or firewall to untrusted state.
The DHCP Snooping Port Setting screens in Figure 4-9-37 & Figure 4-9-38 appear.
Figure 4-9-37 DHCP Snooping Port Setting Page Screenshot
The page includes the following fields:
Object Description
 Port Select port from this drop-down list
 Type Indicates the DHCP snooping port mode. Possible port modes are:
 Trusted: Configures the port as trusted sources of the DHCP message.
 Untrusted: Configures the port as untrusted sources of the DHCP
message.
 Chaddr Check Indicates that the Chaddr check function is enabled on selected port.
Chaddr: Client hardware address.
Buttons
: Click to apply changes.