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CHAPTER
20-1
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
20
Configuring DHCP Features and IP Source Guard
Features
This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP
server port-based address allocation features on the Catalyst 2960 and 2960-S switches. It also describes
how to configure the IP source guard feature. Unless otherwise noted, the term switch refers to a
standalone switch and to a switch stack.
Note To use the IP source guard feature, the switch must be running the LAN Base image.
Note Stacking is supported only Catalyst 2960-S switches.
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 Snooping, page 20-2
• Configuring DHCP Snooping, page 20-9
• Displaying DHCP Snooping Information, page 20-14
• Understanding IP Source Guard, page 20-14
• Configuring IP Source Guard, page 20-16
• Displaying IP Source Guard Information, page 20-22
• Understanding DHCP Server Port-Based Address Allocation, page 20-22
• Configuring DHCP Server Port-Based Address Allocation, page 20-22
• Displaying DHCP Server Port-Based Address Allocation, page 20-25