User Manual UMN:CLI
V5808
337
To specify a DHCP helper address, use the following command.
ip dhcp helper-address A.B.C.D
Specifies a DHCP helper address. More than one
address is possible.
A.B.C.D: DHCP server address
no ip dhcp helper-address
{A.B.C.D | all}
Deletes a specified packet forwarding address.
If a DHCP helper address is specified on an interface, the V5808 will enable a DHCP
relay agent.
You can also specify an organizationally unique identifier (OUI) when configuring a DHCP
helper address. The OUI is a 24-bit number assigned to a company or organization for
use in various network hardware products, which is a first 24 bits of a MAC address. If an
OUI is specified, a DHCP relay agent will forward DHCP_DISCOVER message to a
specific DHCP server according to a specified OUI.
To specify a DHCP helper address with an OUI, use the following command.
ip dhcp oui XX:XX:XX helper-
address A.B.C.D
Specifies a DHCP helper address with an OUI. More
than one address is possible.
XX:XX:XX: OUI (first 24 bits of a MAC address in the
form of hexadecimal)
A.B.C.D: DHCP server address
no ip dhcp oui XX:XX:XX
[helper-address A.B.C.D]
Deletes a specified DHCP helper address.
8.5.4.2 Smart Relay Agent Forwarding
Normally, a DHCP relay agent forwards DHCP_DISCOVER message to a DHCP server
only with a primary IP address on an interface, even if there is more than one IP address
on the interface.
If the smart relay agent forwarding is enabled, a DHCP relay agent will retry sending
DHCP_DISCOVER message with a secondary IP address, in case of no response from
the DHCP server.
To enable the smart relay agent forwarding, use the following command.
8.5.4.3 DHCP Server ID Option
In case that more than two DHCP servers are connected to one DHCP relay agent, if the
relay agent is supposed to broadcast the DHCP_DISCOVER message sent from a DHCP
client to all connected DHCP servers, and then the servers will return DHCP_OFFER
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