Operation Manual

Chapter 6 Tutorials
GS1920 Series User’s Guide
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7 Go to Advanced Application > IP Source Guard > IPv4 Source Guard Setup > 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 an Option82 Profile in the entry. See Section 26.11.1.3 on page 238.
Figure 36 Tutorial: Enable DHCP Snooping on this VLAN
8 Click Save at the top right corner of the web configurator to save
the configuration permanently.
9 Connect 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.
10 To check if DHCP snooping works, go to Advanced Application > IP Source Guard > IPv4 Source Guard
Setup, you should see an IP assignment with the type DHCP-Snooping as shown.
Figure 37 Tutorial: Check the Binding If DHCP Snooping Works
You can also telnet. Use the command “show dhcp snooping binding” to see the DHCP snooping
binding table as shown next.
6.3 How to Use DHCPv4 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.
sysname# show dhcp snooping binding
MacAddress IpAddress Lease Type VLAN Port
----------------- --------------- ------------ ------------- ---- -----
00:02:00:00:00:1c 10.10.1.16 6d23h59m20s dhcp-snooping 100 7
Total number of bindings: 1