RGPS-92222GCP-NP Series User Manual
ORing Industrial Networking Corp.
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and the server when they are not in the same subnet domain to
prevent the DHCP broadcast message from flooding for security
considerations.
Disabled
: disable DHCP relay
Relay Server
Indicates the DHCP relay server IP address. A DHCP relay agent is
used to forward and transfer DHCP messages between the clients
and the server when they are not in the same subnet domain.
Relay Information
Mode
Indicates the existing DHCP relay information mode. The format of
DHCP option 82 circuit ID format is "[vlan_id][module_id][port_no]".
The first four characters represent the VLAN ID, and the fifth and
sixth characters are the module ID. In stand-alone devices, the
module ID always equals to 0; in stacked devices, it means switch
ID. The last two characters are the port number. For example,
"00030108" means the DHCP message received form VLAN ID 3,
switch ID 1, and port No. 8. The option 82 remote ID value equals to
the switch MAC address.
The modes include:
Enabled: activate DHCP relay information. When DHCP relay
information is enabled, the agent inserts specific information (option
82) into a DHCP message when forwarding to a DHCP server and
removes it from a DHCP message when transferring to a DHCP
client. It only works when DHCP relay mode is enabled.
Disabled: disable DHCP relay information
Relay Information
Policy
Indicates the policies to be enforced when receiving DHCP relay
information. When DHCP relay information mode is enabled, if the
agent receives a DHCP message that already contains relay agent
information, it will enforce the policy. The Replace option is invalid
when relay information mode is disabled. The policies includes:
Replace: replace the original relay information when a DHCP
message containing the information is received.
Keep: keep the original relay information when a DHCP message
containing the information is received.
Drop: drop the package when a DHCP message containing the
information is received.
The relay statistics shows the information of relayed packet of the switch.
