CHAPTER
20-1
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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20
Configuring DHCP Features
This chapter describes how to configure DHCP snooping and the option-82 data insertion features on the
Catalyst 2950 or Catalyst 2955 switch. To use the features described in this chapter, you must have the
enhanced software image (EI) installed on your switch.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release, and refer to the “IP Addressing and Services” section in the Cisco IOS IP and
IP Routing Command Reference, Release 12.1.
This chapter consists of these sections:
• Understanding DHCP Features, page 20-1
• Configuring DHCP Features, page 20-5
• Displaying DHCP Information, page 20-8
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.
The switch supports these DHCP features:
• DHCP Server, page 20-2
• DHCP Relay Agent, page 20-2
• DHCP Snooping, page 20-2
• Option-82 Data Insertion, page 20-3
For information about the DCHP client, refer to the “IP Addressing and Services” section in the Cisco
IOS IP and IP Routing Configuration Guide, Release 12.1.
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