3Com Switch 7750 Configuration Guide Guide

566 CHAPTER 54: DHCP SERVER CONFIGURATION
Interface Address
Pool-based DHCP
Server Configuration
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CAUTION: In the interface address pool mode, after the addresses in the interface
address pool have been assigned, the DHCP server picks IP addresses from the
global interface address pool containing the segment of the interface address pool
and assigns them to the DHCP clients. As a result, the IP addresses obtained from
global address pools and those obtained from interface address pools are not in
the same network segment, so the clients cannot interoperate with each other.
In the interface address pool mode, if the IP addresses in the same address pool
are required to be assigned to the clients on the same VLAN interface, the number
of clients that obtain IP addresses automatically cannot exceed the number of the
IP addresses that can be assigned in the interface address pool.
Configuration Overview An interface address pool is created when the interface is assigned a valid unicast
IP address and you execute the dhcp select interface command in interface view.
The IP addresses contained in it belong to the network segment where the
interface resides in and are available to the interface only.
You can perform certain configurations for DHCP address pools of an interface or
multiple interfaces within specified interface ranges. Configuring for multiple
interfaces eases configuration work load and makes you to configure in a more
convenient way.
Enabling DHCP You need to enable DHCP before performing DHCP configurations. DHCP-related
configurations are valid only when DHCP is enabled.
Tabl e 438 Overview of interface address pool-based DHCP server configuration
Configuration task Remarks Section
Enable DHCP Required “Enabling DHCP”
Configure to assign the IP addresses of the
local interface-based address pools to DHCP
clients
Required
“Configuring to
Assign the IP
Addresses of Interface
Address Pools to
DHCP Clients”
Configure to assign IP
addresses of interface
DHCP address pool to
DHCP clients
Configure to bind IP
address statically to
DHCP clients
One among these two
options is required.
These two options
can be configured at
the same time.
“Configuring to
Assign IP Addresses of
DHCP Address Pools
to DHCP Clients”
Configure to assign IP
addresses dynamically
Configure DNS service for the DHCP server Optional
“Configuring DNS
Services for the DHCP
Server”
Configure NetBIOS service for the DHCP
server
Optional
“Configuring
NetBIOS Services for
DHCP Clients”
Customize DHCP service Optional
“Customizing DHCP
Service”