Example: Dhcp Relay For Two Vlans - ZyXEL Communications VES1724-56 User Manual

Chapter 35 DHCP

35.5.1 Example: DHCP Relay for Two VLANs

The following example displays two VLANs (VIDs 2 and 3) for a campus network. Two DHCP servers
are installed to serve each VLAN. The system is set up to forward DHCP requests from the
dormitory rooms (VLAN 2) to DHCP server X with an IP address of 192.168.2.100. Requests from
the academic buildings (VLAN 3) are sent to DHCP server Y with an IP address of 172.16.1.100.
Note: The port to which the DHCP server connects and the port(s) from which the DHCP
requests come should be in the same VLAN.
Note: To let the Switch discover DHCP servers X and Y using ARP, you must create an IP
domain and management IP address for VLANs 2 and 3.
Figure 202 DHCP Relay for Two VLANs
VLAN 2
VLAN 3
For the example network, configure the VLAN Setting screen as shown.
Figure 203 DHCP Relay for Two VLANs Configuration Example
320
DHCP Server X
192.168.2.100
192.168.2.1
VID 2
172.16.1.1
VID 3
DHCP Server Y
172.16.1.100
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