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Configuring DHCP Features
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Default DHCP Configuration
Table 20-1
Table 20-1
Feature
DHCP server
DHCP relay agent
DHCP packet forwarding address
Checking the relay agent information
DHCP relay agent forwarding policy
DHCP snooping enabled globally
DHCP snooping information option
DHCP snooping option to accept packets on
untrusted input interfaces
DHCP snooping limit rate
DHCP snooping trust
DHCP snooping VLAN
DHCP snooping MAC address verification
Cisco IOS DHCP server binding database
DHCP snooping binding database agent
1. The switch responds to DHCP requests only if it is configured as a DHCP server.
2. The switch relays DHCP packets only if the IP address of the DHCP server is configured on the SVI of the DHCP client.
3. Use this feature when the switch is an aggregation switch that receives packets with option-82 information from an edge
DHCP Snooping Configuration Guidelines
These are the configuration guidelines for DHCP snooping.
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Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
20-8
Enabling DHCP Snooping and Option 82, page 20-11
Enabling DHCP Snooping on Private VLANs, page 20-13
Enabling the Cisco IOS DHCP Server Database, page 20-13
Enabling the DHCP Snooping Binding Database Agent, page 20-14
shows the default DHCP configuration.
Default DHCP Configuration
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switch.
You must globally enable DHCP snooping on the switch.
DHCP snooping is not active until DHCP snooping is enabled on a VLAN.
Chapter 20
Configuring DHCP Features and IP Source Guard
Default Setting
Enabled in Cisco IOS software, requires configuration
2
Enabled
None configured
Enabled (invalid messages are dropped)
Replace the existing relay agent information
Disabled
Enabled
Disabled
None configured
Untrusted
Disabled
Enabled
Enabled in Cisco IOS software, requires configuration.
The switch gets network addresses and
Note
configuration parameters only from a device
configured as a DHCP server.
Enabled in Cisco IOS software, requires configuration.
This feature is operational only when a destination is
configured.
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OL-8915-03
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Troubleshooting
