Transition Networks
SISGM
–CHAS L2/L3 Switch User Guide
33625 Rev. B
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5.2.4 DHCP Relay
DHCP relay is used to forward and transfer DHCP messages between the clients and the server
when they are not in the same subnet domain. You can configure the function in this page.
Label
Description
Relay Mode
Indicates the existing DHCP relay mode. The modes include:
Enabled
: activate DHCP relay. When DHCP relay is enabled,
the agent forwards and transfers DHCP messages between
the clients 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.