xStack DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
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DHCP Agent
Information Option 82
Check
This field can be toggled between
Enabled
and
Disabled
using the pull-down menu. It is
used to enable or disable the Switches ability to check the validity of the packet’s option 82
field.
Enabled
– When the field is toggled to
Enable
, the relay agent will check the validity of the
packet’s option 82 field. If the switch receives a packet that contains the option-82 field from
a DHCP client, the switch drops the packet because it is invalid. In packets received from
DHCP servers, the relay agent will drop invalid messages.
Disabled-
When the field is toggled to
Disabled
, the relay agent will not check the validity of
the packet’s option 82 field.
DHCP Agent
Information Option 82
Policy
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 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.
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, 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.