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18-1
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
78-17058-01
18
Configuring DHCP Features and IP Source Guard
This chapter describes how to configure DHCP snooping and the option-82 data insertion features on the
Cisco ME 3400 Ethernet Access witch. It also describes how to configure the IP source guard feature,
which is supported on switches running the metro access and metro IP access images.
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 18-1
• Configuring DHCP Features, page 18-6
• Displaying DHCP Snooping Information, page 18-13
• Understanding IP Source Guard, page 18-13
• Configuring IP Source Guard, page 18-14
• Displaying IP Source Guard Information, page 18-16
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 18-2
• DHCP Relay Agent, page 18-2
• DHCP Snooping, page 18-2
• Option-82 Data Insertion, page 18-3
• DHCP Snooping Binding Database, page 18-5
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.