UMN:CLI
User Manual
V8102
408
the switch is configured to not forward broadcast traffic. To solve this problem, you can
configure the interface that is receiving the broadcasts to forward certain classes of
broadcast to a helper address.
To specify a DHCP helper address, use the following command.
Command
Mode
Description
ip dhcp helper-address
A.B.C.D
Interface
[VLAN]
Specifies a DHCP helper address. More than one ad-
dress 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 V8102 will enable a DHCP re-
lay 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 spe-
cific DHCP server according to a specified OUI.
To specify a DHCP helper address with an OUI, use the following command.
Command
Mode
Description
ip dhcp oui
XX:XX:XX
helper-
address
A.B.C.D
Interface
[VLAN]
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.
9.6.4.2
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.
Command
Mode
Description
ip dhcp smart-relay
Global
Enables a smart relay.
no ip dhcp smart-relay
Disables a smart relay.
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