Cisco WS-C3750-48PS-S User Manual

21-7
Catalyst 3750 Switch Software Configuration Guide
78-16180-02
Chapter 21 Configuring DHCP Features and IP Source Guard
Configuring DHCP Features
Configuring DHCP Features
These sections describe how to configure the DHCP server, the DHCP relay agent, DHCP snooping,
option 82, the Cisco IOS DHCP server binding database, and the DHCP snooping binding database on
your switch:
• Default DHCP Configuration, page 21-7
• DHCP Snooping Configuration Guidelines, page 21-8
• Configuring the DHCP Server, page 21-8
• DHCP Server and Switch Stacks, page 21-9
• Configuring the DHCP Relay Agent, page 21-9
• Specifying the Packet Forwarding Address, page 21-9
• Enabling DHCP Snooping and Option 82, page 21-10
• Enabling DHCP Snooping on Private VLANs, page 21-12
• Enabling the Cisco IOS DHCP Server Database, page 21-12
• Enabling the DHCP Snooping Binding Database Agent, page 21-12
Default DHCP Configuration
Table 21-1 shows the default DHCP configuration.
Table 21-1 Default DHCP Configuration
Feature Default Setting
DHCP server Enabled
1
1. The switch responds to DHCP requests only if it is configured as a DHCP server.
DHCP relay agent Enabled
2
2. The switch relays DHCP packets only if the IP address of the DHCP server is configured on the SVI of the DHCP client.
DHCP packet forwarding address None configured
Checking the relay agent information Enabled (invalid messages are dropped)
2
DHCP relay agent forwarding policy Replace the existing relay agent information
2
Cisco IOS DHCP server binding database
3
3. This feature is supported only when your switch is running the enhanced multilayer image (EMI).
Enabled
4
4. The switch gets network addresses and configuration parameters only from a device configured as DHCP server.
DHCP snooping enabled globally Disabled
DHCP snooping information option Enabled
DHCP snooping limit rate None configured
DHCP snooping trust Untrusted
DHCP snooping VLAN Disabled
DHCP snooping MAC address verification Enabled
DHCP snooping binding database agent
3
Enabled

Cisco WS-C3750-48PS-S Specifications

General

Brand	Cisco
Model	WS-C3750-48PS-S
Category	Switch
Language	English