ZyXEL Communications Plumbing Product metrogigabit switch User Manual

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Chapter 37 DHCP
MGS3700-12C User’s Guide
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37.2  DHCP Status 
Click IP Application > DHCP in the navigation panel. The DHCP Status screen 
displays. 
Figure 177   IP Application > DHCP Status 
The following table describes the labels in this screen. 
37.3  DHCP Relay 
Configure DHCP relay on the Switch if the DHCP clients and the DHCP server are 
not in the same broadcast domain. During the initial IP address leasing, the 
Switch helps to relay network information (such as the IP address and subnet 
mask) between a DHCP client and a DHCP server. Once the DHCP client obtains an 
IP address and can connect to the network, network information renewal is done 
between the DHCP client and the DHCP server without the help of the Switch.
The Switch can be configured as a global DHCP relay. This means that the Switch 
forwards all DHCP requests from all domains to the same DHCP server. You can 
also configure the Switch to relay DHCP information based on the VLAN 
membership of the DHCP clients.
37.3.1  DHCP Relay Agent Information 
The Switch can add information about the source of client DHCP requests that it 
relays to a DHCP server by adding Relay Agent Information. This helps provide 
authentication about the source of the requests. The DHCP server can then 
provide an IP address based on this information. Please refer to RFC 3046 for 
more details. 
Table 118   IP Application > DHCP 
LABEL
DESCRIPTION
Relay Mode
This field displays:
• None - if the Switch is not configured as a DHCP relay agent.
• Global - if the Switch is configured as a DHCP relay agent only.
• VLAN - followed by a VLAN ID if it is configured as a relay agent for 
specific VLAN(s).