Asus GigaX2048 - Manual (Page 61)

GigaX Series L2 Managed Switch User Guide
4.5.10 DHCP Snooping
DHCP snooping is a DHCP security feature that provides security by
filtering untrusted DHCP messages and by building and maintaining a
DHCP binding table. You can assign some ports to be trusted ports. The
selected (trusted) port forwards the DHCP packets as a normal port, but
the DHCP ACK packets will be dropped when the unselected (untrusted)
port receives the packets.
DHCP Snooping: enable or disable DHCP snooping.
Figure 36. DHCP Snooping (GigaX 2048)