ZyXEL Communications XS3800-28, User Manual, Page: 474 / 789

Chapter 64 DHCP
XS3800-28 User’s Guide
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The following table describes the labels in this screen.
64.5.2 DHCP Smart Relay Configuration Example
The follow figure shows a network example where the Switch is used to relay DHCP requests for the
VLAN1 and VLAN2 domains. There is only one DHCP server that services the DHCP clients in both
domains.
Figure 366 DHCP Smart Relay Network Example
Configure the NETWORKING > DHCP > DHCPv4 Relay > DHCP Smart Relay screen as shown. Make sure
you select a DHCP option 82 profile ( default1 in this example) to set the Switch to send additional
information (such as the VLAN ID) together with the DHCP requests to the DHCP server. This allows the
Table 242 NETWORKING > DHCP > DHCPv4 Relay > DHCP Smart Relay > Add/Edit
LABEL DESCRIPTION
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 a range. For
example, enter “3-5” for ports 3, 4, and 5. Enter “3,5,7” for ports 3, 5, and 7.
In Stacking mode, the first number represents the slot and the second the port number. Enter 1/
1-1/24,2/28 for ports 1 to 24 for the Switch in slot 1 and port 28 for the Switch in slot 2, for example.
Option 82 Profile Select a pre-defined DHCP option 82 profile that the Switch applies to the specified ports. 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 NETWORKING > DHCP >
DHCPv4 Relay > DHCPv4 Smart Relay screen.
Apply Click Apply 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.
Clear Click Clear to clear the fields to the factory defaults.
Cancel Click Cancel to not save the configuration you make and return to the last screen.