Ip Dhcp Snooping Limit Rate - Cisco Catalyst 3560-X Command Reference Manual

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

ip dhcp snooping limit rate

Syntax Description
Defaults
Command Modes
Command History
Usage Guidelines
Examples
Related Commands
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Use the ip dhcp snooping limit rate interface configuration command on the switch stack or on a
standalone switch to configure the number of DHCP messages an interface can receive per second. Use
the no form of this command to return to the default setting.
ip dhcp snooping limit rate rate
no ip dhcp snooping limit rate
rate Number of DHCP messages an interface can receive per second. The range is 1 to
2048.
DHCP snooping rate limiting is disabled.
Interface configuration
Release Modification
12.2(53)SE2 This command was introduced.
Normally, the rate limit applies to untrusted interfaces. If you want to configure rate limiting for trusted
interfaces, keep in mind that trusted interfaces might aggregate DHCP traffic on multiple VLANs (some
of which might not be snooped) in the switch, and you will need to adjust the interface rate limits to a
higher value.
If the rate limit is exceeded, the interface is error-disabled. If you enabled error recovery by entering the
errdisable recovery dhcp-rate-limit global configuration command, the interface retries the operation
again when all the causes have timed out. If the error-recovery mechanism is not enabled, the interface
stays in the error-disabled state until you enter the shutdown and no shutdown interface configuration
commands.
This example shows how to set a message rate limit of 150 messages per second on an interface:
Switch(config-if)# ip dhcp snooping limit rate 150
You can verify your settings by entering the show ip dhcp snooping user EXEC command.
Command
errdisable recovery
show ip dhcp snooping
show ip dhcp snooping binding
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Description
Configures the recover mechanism.
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding information.
Catalyst 3750-X and 3560-X Switch Command Reference
ip dhcp snooping limit rate
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