Cisco Gigabit Ethernet Switch Module for HP p-Class BladeSystem Software Configuration Guide

CHAPTER

16-1

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Configuring DHCP Features

This chapter describes how to configure DHCP snooping and the option-82 data insertion features on

the switch.

Note For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release, and see the “DHCP Commands” section in the Cisco IOS IP Command

Reference, Volume 1 of 3: Addressing and Services, Release 12.2.

This chapter consists of these sections:

• Understanding DHCP Features, page 16-1

• Configuring DHCP Features, page 16-5

• Displaying DHCP Snooping Information, page 16-9

Understanding DHCP Features

DHCP is widely used in LAN environments to dynamically assign host IP addresses from a centralized

server, which significantly reduces the overhead of administration of IP addresses. DHCP also helps

conserve the limited IP address space because IP addresses no longer need to be permanently assigned

to hosts; only those hosts that are connected to the network consume IP addresses.

These sections contain this information:

• DHCP Server, page 16-2

• DHCP Relay Agent, page 16-2

• DHCP Snooping, page 16-2

• Option-82 Data Insertion, page 16-3

For information about the DHCP client, see the “Configuring DHCP” section of the “IP Addressing and

Services” section of the Cisco IOS IP Configuration Guide, Release 12.2.