CHAPTER
24-1
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
24
Configuring DHCP Features and IP Source Guard
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 3750-X or 3560-X switch. It also describes
ho
w to configure the IP source guard feature.Unless otherwise noted, the term switch refers to a
Catalyst 3750-X or 3560-X standalone switch and to a Catalyst 3750-X switch stack.
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.
• Understanding DHCP Features, page 24-1
• Configuring DHCP Features, page 24-8
• Displaying DHCP Snooping Information, page 24-16
• Understanding IP Source Guard, page 24-16
• Configuring IP Source Guard, page 24-18
• Displaying IP Source Guard Information, page 24-25
• Understanding DHCP Server Port-Based Address Allocation, page 24-26
• Configuring DHCP Server Port-Based Address Allocation, page 24-26
• Displaying DHCP Server Port-Based Address Allocation, page 24-29
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 24-2
• DHCP Relay Agent, page 24-2
• DHCP Snooping, page 24-2
• Option-82 Data Insertion, page 24-3
• DHCP Snooping and Switch Stacks, page 24-7
To Next Page
Loading...
Need help?
General