ZyXEL Communications GS2220 Series - Example: DHCP Relay for Two Vlans

GS2220 Series User’s Guide
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Fig ure 289 IP Application > DHCP > DHCPv4 > VLAN > Port
The following table describes the labels in this screen.
44.4.8 Exa m ple : DHC P Re la y fo r Two VLANs
The following example displays two VLANs (VIDs 1 and 2) 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 1) to the DHCP server with an IP address of 192.168.1.100. Requests from the academic buildings
(VLAN 2) are sent to the other DHCP server with an IP address of 172.16.10.100.
Table 198 IP Application > DHCP > DHCPv4 > VLAN > Port
LABEL DESCRIPTIO N
VID Enter the ID number of the VLAN you want to configure here.
Port Enter the number of ports to which you want to apply the specified DHCP option 82 profile.
You can enter multiple ports separated by (no space) comma (,) or hyphen (–). For example,
enter “3–5” for ports 3, 4, and 5. Enter “3,5,7” for ports 3, 5, and 7.
Option 82 Profile Select a pre-defined DHCP option 82 profile that the Switch applies to the specified ports in this
VLAN. The Switch adds the Circuit ID sub-option and/or Remote ID sub-option specified in the
profile to DHCP requests that it relays to a DHCP server.
The profile you select here has priority over the one you select in the DHC P > DHC Pv4 > VLAN
screen.
Add Click this to create a new entry or to update an existing one.
This saves 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 Sa ve link on the top navigation panel to save your changes
to the non-volatile memory when you are done configuring.
Cancel Click this to reset the values above based on the last selected entry or, if not applicable, to
clear the fields above.
Clear Click C le a r to reset the fields to the factory defaults.
Index This field displays a sequential number for each entry. Click an index number to change the
settings.
VID This field displays the VLAN to which the ports belongs.
Port This field displays the ports to which the Switch applies the settings.
Profile Name This field displays the DHCP option 82 profile that the Switch applies to the ports in this VLAN.
Select an entry’s check box to select a specific entry. Otherwise, select the check box in the
table heading row to select all entries.
Delete Select the entries that you want to remove, then click the De le te button to remove the selected
entries from the table.
Cancel Click this to clear the check boxes above.