ZyXEL VES1724-56 User Guide - Page 311

Chapter 36 DHCP Table 144 IP Application > DHCP > VLAN (continued) LABEL Remote ID Information DESCRIPTION Select the first option and enter a string of up to 32 ASCII characters for the remote ID information in this field. Spaces are allowed. Add Cancel Clear VID Type DHCP Status Delete Cancel Otherwise, select the second option to have the Switch use the name of the port on which the DHCP requests are received. Click Add to save your changes to the Switch's run-time memory. The Switch loses these changes if it is turned off or loses power, so use the Save link on the top navigation panel to save your changes to the non-volatile memory when you are done configuring. Click Cancel to begin configuring this screen afresh. Click this to clear the fields above. This field displays the ID number of the VLAN group to which this DHCP settings apply. This field displays the DHCP mode (Relay). For DHCP relay configuration, this field displays the first remote DHCP server IP address. Select the configuration entries you want to remove and click Delete to remove them. Click Cancel to clear the Delete check boxes. 36.4.1 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 191 DHCP Relay for Two VLANs DHCP Server X 192.168.2.100 VLAN 2 VLAN 3 192.168.2.1 VID 2 172.16.1.1 VID 3 DHCP Server Y 172.16.1.100 VES1724-56 User's Guide 311