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Parameters: <pps>: The number of DHCP messages transmitted in every minute,
ranging from 0 to 100. Its default value is 100. 0 means that no DHCP message will be
transmitted.
Command Mode: Globe mode
Default Settings: The default value is 100.
Usage Guide: After enabling DHCP snooping, the switch will monitor all the DHCP
messages and implement software transmission. The software performance of the switch
is relative to the type of the switch, its current load and so on.
Example: Set the message transmission rate as 50pps.
switch(config)#ip dhcp snooping limit-rate 50
22.17 ip dhcp snooping information enable
Command: ip dhcp snooping information enable
no ip dhcp snooping information enable
Function: This command will enable option 82 function of DHCP Snooping on the switch,
the no operation of this command will disable that function.
Parameters: None.
Default Settings: Option 82 function is disabled in DHCP Snooping by default.
Command Mode: Global Configuration Mode.
Usage Guide: Only by implementing this command, can DHCP Snooping add standard
option 82 to DHCP request messages and forward the message. The format of option1 in
option 82 (Circuit ID option) is standard vlan name plus physical port name, like
―vlan1+ethernet1/12‖. That of option2 in option 82 (remote ID option) is CPU MAC of the
switch, like ―00030f023301‖. If a DHCP request message with option 82 options is
received, DHCP Snooping will replace those options in the message with its own. If a
DHCP reply message with option 82 options is received, DHCP Snooping will dump those
options in the message and forward it. This command and ―ip dhcp snooping option82
enable‖ command are mutually exclusive.
Examples: Enable option 82 function of DHCP Snooping on the switch.
Switch(config)#ip dhcp snooping enable
Switch(config)# ip dhcp snooping binding enable
Switch(config)# ip dhcp snooping information enable
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