ZyXEL Communications ES3500-24 User Manual page 54

Chapter 6 Tutorials
Go to Advanced Application > IP Source Guard > DHCP snooping > Configure, activate and
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specify VLAN 100 as the DHCP VLAN as shown. Click Apply.
Click the Port link at the top right corner.
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The DHCP Snooping Port Configure screen appears.
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Select Trusted in the Server Trusted state field for port 5 because the DHCP server is connected
to port 5. Keep ports 6 and 7 Untrusted because they are connected to DHCP clients. Click Apply.
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ES3500 Series User's Guide