RocketLinx MP1204-XT User Guide
: 2000644 Rev. A
Configuration Pages - 53
DHCP | Relay
DHCP | Relay
A DHCP relay agent is used to forward and to transfer DHCP messages between the clients and the server
when they are not in the same subnet domain. It stores the incoming interface IP address in the GIADDR
field of the DHCP packet. The DHCP server can use the value of GIADDR field to determine the assigned
subnet. For such condition, please make sure that the switch configuration of VLAN interface IP address and
PVID (Port VLAN ID) are correct.
Item
Configuration | DHCP | Relay
Relay Mode
Indicates the DHCP relay mode operation.
Possible modes are:
•
Enabled
: Enable the DHCP relay mode operation. When DHCP relay mode operation
is enabled, the agent forwards and transfers DHCP messages between the clients
and the server when they are not in the same subnet domain. The DHCP broadcast
message is not be flooded for security considerations.
•
Disabled
: Disable DHCP relay mode operation.
Relay Server
Indicates the DHCP relay server IP address.
Relay
Information
Mode
Indicates the DHCP relay information mode option operation. The option 82 circuit ID
format as [
vlan_id][module_id][port_no
]. The first four characters represent the VLAN
ID, the fifth and sixth characters are the module ID (0), and the last two characters are
the port number. For example,
00030108
means that the DHCP message was received
from VLAN ID 3, switch ID 1, port No The Option 82 remote ID value is equal the
switch MAC address.
Possible modes are:
•
Enabled
: Enable the DHCP relay information mode operation. 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.
Relay
Information
Policy
Indicates the DHCP relay information option policy. When DHCP relay information
mode operation is enabled, if the agent receives a DHCP message that already contains
relay agent information it enforces the policy. The
Replace
policy is invalid when relay
information mode is disabled. Possible policies are:
•
Replace
: Replaces the original relay information when a DHCP message that already
contains it is received.
•
Keep
: Keeps the original relay information when a DHCP message that already
contains it is received.
•
Drop
: Drops the package when a DHCP message that already contains relay
information is received.
Summary of Contents for RocketLinx MP1204-XT
Page 28: ...28 Installing the Hardware RocketLinx MP1204 XT User Guide 2000644 Rev A System Reset ...
Page 36: ...36 Web Interface Overview RocketLinx MP1204 XT User Guide 2000644 Rev A Ending a Session ...
Page 180: ...180 Configuration Pages RocketLinx MP1204 XT User Guide 2000644 Rev A Configuration DDMI ...
Page 414: ...414 Glossary RocketLinx MP1204 XT User Guide 2000644 Rev A Y ...