Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

ip dhcp snooping limit rateChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandsip dhcp snooping limit rateUse the ip dhcp snooping limit rate interface configuration command on the switch stack or on astandalone switch to configure the number of DHCP messages an interface can receive per second. Usethe no form of this command to return to the default setting.ip dhcp snooping limit rate rateno ip dhcp snooping limit rateSyntax DescriptionrateNumber of DHCP messages an interface can receive per second. The range is 1 to2048.DefaultsDHCP snooping rate limiting is disabled.Command ModesInterface configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesNormally, the rate limit applies to untrusted interfaces. If you want to configure rate limiting for trustedinterfaces, keep in mind that trusted interfaces might aggregate DHCP traffic on multiple VLANs (someof which might not be snooped) in the switch, and you will need to adjust the interface rate limits to ahigher value.If the rate limit is exceeded, the interface is error-disabled. If you enabled error recovery by entering theerrdisable recovery dhcp-rate-limit global configuration command, the interface retries the operationagain when all the causes have timed out. If the error-recovery mechanism is not enabled, the interfacestays in the error-disabled state until you enter the shutdown and no shutdown interface configurationcommands.ExamplesThis 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 150You can verify your settings by entering the show ip dhcp snooping user EXEC command.Related CommandsCommanderrdisable recoveryshow ip dhcp snoopingshow ip dhcp snooping bindingDescriptionConfigures the recover mechanism.Displays the DHCP snooping configuration.Displays the DHCP snooping binding information.2-242Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08