ZyXEL Communications ES3500 Series 6.2 How to Use DHCP Relay on the Switch, Save, Option82, Information, dhcp-snooping, IP Source Guard, Advanced Application

Chapter 6 Tutorials

7Go to Advanced Application > IP Source Guard > DHCP snooping > Configure > VLAN, show VLAN 100 by entering 100 in the Start VID and End VID fields and click Apply. Then select Yes in the Enabled field of the VLAN 100 entry shown at the bottom section of the screen.

If you want to add more information in the DHCP request packets such as source VLAN ID or system name, you can also select the Option82 and Information fields in the entry. See Section 26.5.1 on page 225.

8Click Save at the top right corner of the web configurator to save the configuration permanently.

9Connect your DHCP server to port 5 and a computer (as DHCP client) to either port 6 or 7. The computer should be able to get an IP address from the DHCP server. If you put the DHCP server on port 6 or 7, the computer will not able to get an IP address.

10To check if DHCP snooping works, go to Advanced Application > IP Source Guard, you should see an IP assignment with the type dhcp-snoopingas shown.

You can also telnet or log into the Switch’s console. Use the command “show dhcp snooping binding” to see the DHCP snooping binding table as shown next.

sysname# show dhcp snooping		binding	Lease	Type	VLAN	Port
MacAddress		IpAddress
00:02:00:00:00:1c-----------------	--------------- ------------ ------------- ---- -----
	10.10.1.16		6d23h59m20s	dhcp-snooping	100	7
Total number of bindings:		1

6.2 How to Use DHCP Relay on the Switch

This tutorial describes how to configure your Switch to forward DHCP client requests to a specific DHCP server. The DHCP server can then assign a specific IP address based on the information in the DHCP requests.

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ES3500 Series User’s Guide