Enterasys Networks 9034313-07 manual Dhcp Server Configuration, Dhcp Overview, Dhcp Relay Agent

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16

DHCP Server Configuration

This chapter describes the commands to configure the IPv4 DHCP server functionality on a SecureStack C3 switch.

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DHCP Overview

16-1

 

 

Configuring General DHCP Server Parameters

16-3

 

 

Configuring IP Address Pools

16-12

 

 

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 SecureStack 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 19‐18) for more information.

DHCP Server

DHCP server functionality allows the SecureStack 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 SecureStack C3 maintains a lease database which contains information about each assigned IP

SecureStack C3 Configuration Guide 16-1

Page 481
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Enterasys Networks 9034313-07 manual Dhcp Server Configuration, Dhcp Overview, Dhcp Relay Agent