ZyXEL Communications Plumbing Product metrogigabit switch User Manual

 Chapter 6 Tutorials

MGS3700-12C User’s Guide

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

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.

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

Figure 31   Tutorial: Check the Binding If DHCP Snooping Works

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.

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.

In this example, you have configured your DHCP server (192.168.2.3) and want to 
have it assign a specific IP address (say 172.16.1.18) to DHCP client A based on 

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