Draytek VigorSwitch P2261 User Manual page 189

Relay Information Policy
After finished the above settings, click Apply to save the configuration. The settings will
take effect.
VigorSwitch P2261 User's Guide
When DHCP relay information mode operation is enabled,
the agent inserts specific information (option 82) into a
DHCP message when forwarding to DHCP server and
removes it from a DHCP message when transferring to
DHCP client. It only works when DHCP relay operation
mode is enabled.
Disabled: Disable DHCP relay information mode operation.
Indicates the DHCP relay information option policy. When
DHCP relay information mode operation is enabled, if agent
receives a DHCP message that already contains relay agent
information it will enforce the policy. And it only works
under DHCP if relay information operation mode is
enabled. Possible policies are:
Replace: Replace the original relay information when a
DHCP message that already contains it is received.
Keep: Keep the original relay information when a DHCP
message that already contains it is received.
Drop: Drop the package when a DHCP message that already
contains relay information is received.
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