CHAPTER
20-1
Cisco IE 3000 Switch Software Configuration Guide
OL-13018-01
20
Configuring DHCP Features
This chapter describes how to configure DHCP snooping and the option-82 data insertion features on the
IE 3000 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 from the Cisco.com page under
Documentation > Cisco IOS Software > 12.2 Mainline > Command References.
This chapter consists of these sections:
• Understanding DHCP Features, page 20-1
• Configuring DHCP Features, page 20-6
• Displaying DHCP Snooping Information, page 20-12
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 20-2
• DHCP Relay Agent, page 20-2
• DHCP Snooping, page 20-2
• Option-82 Data Insertion, page 20-3
• DHCP Snooping Binding Database, page 20-5
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 from the Cisco.com page under
Documentation > Cisco IOS Software > 12.2 Mainline > Configuration Guides.
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