Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

Command or Action
Step 10
ip dhcp snooping trust
Example:
Switch(config-if)# ip dhcp snooping
trust
Step 11
ip dhcp snooping limit rate rate
Example:
Switch(config-if)# ip dhcp snooping
limit rate 100
Step 12 exit
Example:
Switch(config-if)# exit
Step 13
ip dhcp snooping verify mac-address
Example:
Switch(config)# ip dhcp snooping verify
mac-address
Step 14 end
Example:
Switch(config)# end
Step 15
show running-config
Example:
Switch# show running-config
Step 16
copy running-config startup-config
Example:
Switch# copy running-config
startup-config
Purpose
(Optional) Configures the interface as trusted or untrusted. Use the no
keyword to configure an interface to receive messages from an untrusted
client. The default setting is untrusted.
(Optional) Configures the number of DHCP packets per second that an
interface can receive. The range is 1 to 2048. By default, no rate limit
is configured.
Note
Returns to global configuration mode.
(Optional) Configures the switch to verify that the source MAC address
in a DHCP packet received on untrusted ports matches the client
hardware address in the packet. The default is to verify that the source
MAC address matches the client hardware address in the packet.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

We recommend an untrusted rate limit of not more than 100
packets per second. If you configure rate limiting for trusted
interfaces, you might need to increase the rate limit if the port
is a trunk port assigned to more than one VLAN with DHCP
snooping.
How to Configure DHCP Features
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