Enterasys C3 Configuration Guide 22-1
22
DHCP Server Configuration
This chapter describes the commands to configure the IPv4 DHCP server functionality on a
Enterasys C3 switch.
DHCP Overview
Dynamic Host Configuration Protocol (DHCP) for IPv4 is a network layer protocol that
implements automatic or manual assignment of IP addresses and other configuration information
to client devices by servers. A DHCP server manages a user-configured pool of IP addresses from
which it can make assignments upon client requests. A relay agent passes DHCP messages
between clients and servers which are on different physical subnets.
DHCP Relay Agent
The DHCP/BOOTP relay agent function can be configured on all of the Enterasys C3’s routing
interfaces. The relay agent can forward a DHCP client’s request to a DHCP server located on a
different network if the address of the server is configured as a helper address on the receiving
interface. The relay agent interface must be a VLAN which is configured with an IP address. Refer
to the ip helper-address command (“ip helper-address” on page 25-18) for more information.
DHCP Server
DHCP server functionality allows the Enterasys C3 switch to provide basic IP configuration
information to a client on the network who requests such information using the DHCP protocol.
DHCP provides the following mechanisms for IP address allocation by a DHCP server:
• Automatic—DHCP server assigns an IP address to a client for a limited period of time (or
until the client explicitly relinquishes the address) from a defined pool of IP addresses
configured on the server.
• Manual—A client’s IP address is assigned by the network administrator, and DHCP is used
simply to convey the assigned address to the client. This is managed by means of “static”
address pools configured on the server.
The amount of time that a particular IP address is valid for a system is called a lease. The
Enterasys C3 maintains a lease database which contains information about each assigned IP
For information about... Refer to page...
DHCP Overview 22-1
Configuring General DHCP Server Parameters 22-3
Configuring IP Address Pools 22-12
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