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Chapter 18
Configuring DHCP Features and IP Source Guard
Default DHCP Configuration
Table 18-1
Table 18-1
Feature
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 ingress interfaces
DHCP snooping limit rate
DHCP snooping trust
DHCP snooping VLAN
DHCP snooping MAC address verification
DHCP snooping binding database agent
1. The switch relays DHCP packets only if the IP address of the DHCP server is configured on the SVI of the DHCP client.
2. 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.
•
•
•
•
78-17058-01
shows the default DHCP configuration.
Default DHCP Configuration
2
switch.
You must globally enable DHCP snooping on the switch.
DHCP snooping is not active until DHCP snooping is enabled on a VLAN.
Before globally enabling DHCP snooping on the switch, make sure that the devices acting as the
DHCP server and the DHCP relay agent are configured and enabled.
When you globally enable DHCP snooping on the switch, these Cisco IOS commands are not
available until snooping is disabled. If you enter these commands, the switch returns an error
message, and the configuration is not applied.
ip dhcp relay information check global configuration command
–
ip dhcp relay information policy global configuration command
–
ip dhcp relay information trust-all global configuration command
–
–
ip dhcp relay information trusted interface configuration command
Default Setting
1
Enabled
None configured
Enabled (invalid messages are dropped)
Replace the existing relay agent information
Disabled
Enabled
Disabled
None configured
Untrusted
Disabled
Enabled
Enabled
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring DHCP Features
1
1
18-7
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Troubleshooting
