Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 9 DHCP Configuration Commands
3Com Corporation
9-3
9.1.3 dhcp select (in System View)
Syntax
dhcp select { global [ subaddress ] | interface | relay } { interface interface-type
interface-number [ to interface-type interface-number ] | all }
undo dhcp select { interface interface-type interface-number [ to interface-type
interface-number ] | all }
View
System 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.
interface-type interface-number [ to interface-type interface-number ]: Indicates an
interface or all interfaces from the first specified interface to the second. Note that the
interfaces can be Ethernet interfaces (or subinterfaces), virtual Ethernet interfaces,
synchronous/asynchronous serial interfaces encapsulated with PPP, HDCL, or frame
relay, or E1 interfaces.
all: All the interfaces.
Description
Use the dhcp select command in system view to select a method for multiple
interfaces in a specified range to dispose the DHCP packets destined to the local
device.
Use the undo dhcp select command in system 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).