How To Set Dhcp Snooping? (Dynamic) - ZyXEL Communications GS1920 User Handbook Manual

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8.1.1 How to set DHCP snooping? (Dynamic)

Overview
DHCP snooping, you can configure the DHCP Server on a "Trusted Port" so that all
clients can get the IP address from a trusted DHCP server. Also, all DHCP IP
address assignments will be recorded into an internal table called the "Snooping
Table". So if there is another DHCP server in the network, but located on an untrust
port, all DHCP message will be discard.
Topology,
Note: In the scenario the switch is configure with DHCP snooping trusted port 9, so
that client A or other device can get an IP from the DHCP server. At the right side
if the port is not been configured with trusted port (10.10.10.0/24) all DHCP
packets will be discard and client A still gets IP with the DHCP server
(192.168.1.0/24) trusted port.
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