Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 9 DHCP Configuration Commands
3Com Corporation
9-2
View
Interface view
Parameter
global: The address DHCP client gets is the one selected by the local DHCP server
from a global address pool upon the receipt of the DHCP request from the client.
subaddress: Enables subaddress allocation, allowing the DHCP server to assign a
DHCP client an IP address belonging to a subaddress segment for the Ethernet
interface. This IP address is selected from the global address pool corresponding to the
subaddress segment. When subaddress allocation is enabled, the Ethernet interface
on the DHCP server must be assigned a subaddress located in the subaddress
segment from which subaddresses are selected for DHCP clients. This is to ensure that
the main address and the subaddress assigned to a DHCP client are located in
different network segments.
interface: The address DHCP client gets is the one selected by the local DHCP server
from an interface address pool upon the receipt of the DHCP request from the client.
relay: The address DHCP client gets is allocated by an external DHCP server.
Description
Use the dhcp select command in interface view to select a method for disposing the
DHCP packets destined to the local device.
Use the undo dhcp select command in interface view to restore the default setting.
By default, DHCP packets destined to the local device will be sent to the internal server
and the clients sending them will be allocated with addresses selected from a global
address pool (in global approach).
Currently, DHCP is available only on the following interfaces:
z Ethernet interface or subinterface
z Virtual Ethernet interface
z Synchronous/asynchronous serial interface encapsulated with PPP, HDLC, or
frame relay
z E1 interface
Related command: dhcp select (in system view).
Example
# Allocate addresses selected from an interface address pool on the internal DHCP
server to the clients sending DHCP packets destined to the local device.
[3Com-Ethernet1/0/0] dhcp select interface