Ip Dhcp Snooping Limit Rate - Cisco Catalyst 3550 Command Reference Manual

Multilayer switch

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Catalyst 3550 Switch Cisco IOS Commands

ip dhcp snooping limit rate

Use the ip dhcp snooping limit rate interface configuration command 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

Syntax Description

DHCP snooping rate limiting is disabled.

Command Modes

Interface configuration

Command History

Usage Guidelines

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

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 privileged EXEC command.

ip dhcp snooping limit rate rate

no ip dhcp snooping limit rate

Number of DHCP messages an interface can receive per second. The range is

Modification

This command was introduced.

The range was changed to 1 to 2048.

Catalyst 3550 Multilayer Switch Command Reference

ip dhcp snooping limit rate

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