D-Link xStack User Manual page 63

xStack
DHCP Relay Agent
Information Option 82
Policy
Click Apply to implement any changes that have been made.
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, users may configure a client with the
option-82 field. In this situation, disable the information-check feature so that the Switch
does not remove the option-82 field from the packet. Users may 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.
®
DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
This field can be toggled between Replace, Drop, and Keep by using the pull-down menu.
It is used to set the Switches policy for handling packets when the DHCP Relay Agent
Information Option 82 Check is set to Disabled. The default is Replace.
Replace – The option 82 field will be replaced if the option 82 field already exists in the
packet received from the DHCP client.
Drop – The packet will be dropped if the option 82 field already exists in the packet
received from the DHCP client.
Keep – The option 82 field will be retained if the option 82 field already exists in the packet
received from the DHCP client.
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