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4 Configuration D-Link Smart Managed Switch User Manual
26
DHCP Relay Agent Information Option 82 Remote ID: This field can be toggled between Default and User
Define.
NOTE:
If the Switch receives a packet that
contains the option-82 field from a DHCP client
and the information-checking feature is enabled,
the switch drops the packet because it is invalid.
However, in some instances, you might configure
a client with the option-82 field. In this situation,
you should disable the information-check feature
so that the switch does not remove the option-82
field from the packet. You can configure the action
that the switch takes when it receives a packet
with existing option-82 information by configuring
the DHCP Agent Information Option 82 Policy.
System > DHCP Relay > DHCP Relay Interface Settings
This page allows the user to set up a server, by IP address, for relaying DHCP information the switch. The
user may enter a previously configured IP interface on the Switch that will be connected directly to the DHCP
server using the following window. Properly configured settings will be displayed in the DHCP Relay
Interface Table at the bottom of the following window, once the user clicks the Add button under the Apply
heading. The user may add up to four server IPs per IP interface on the Switch. Entries may be deleted by
clicking Delete button.
Figure 4.24 – System > DHCP Relay > DHCP Relay Interface Settings
Interface: The IP interface on the Switch that will be connected directly to the Server.
Server IP: Enter the IP address of the DHCP server. Up to four server IPs can be configured per IP Interface.
Click Apply to implement changes made.
System > DHCP Local Relay Settings
The DHCP Local Relay Settings page allows the user to configure DHCP Local Relay. DHCP broadcasts are
trapped by the switch CPU, and replacement broadcasts are forwarded with Option 82. Replies from the
DHCP servers are trapped by the switch CPU, the Option 82 is removed and the reply is sent to the DHCP
Client.
Figure 4.25 - System > DHCP Local Relay Settings
DHCP Local Relay Status: Specifies whether DHCP Local Relay is enabled on the device.
Enabled – Enables DHCP Local Relay on the device.
Disabled – Disables DHCP Local Relay on the device. This is the default value.
Config VLAN by: Configure the VLAN by VID or VLAN Name of drop-down menu.
State: Specifies whether DHCP Local Relay is enabled on the VLAN.
Enabled – Enables DHCP Local Relay on the VLAN.
Disabled – Disables DHCP Local Relay on the VLAN.
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