dhcp snooping check dhcp-rate
Function
The dhcp snooping check dhcp-rate command sets the maximum rate of sending DHCP messages to the processing unit.
The undo dhcp snooping check dhcp-rate command restores the default maximum rate of sending DHCP messages to the processing unit.
By default, the maximum rate of sending global DHCP messages to the processing unit is 100 pps, which is the same as the maximum rate of sending DHCP messages on interfaces to the processing unit.
Format
In the system view:
dhcp snooping check dhcp-rate rate [ vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> ]
undo dhcp snooping check dhcp-rate
In the VLAN view and interface view:
dhcp snooping check dhcp-rate rate
undo dhcp snooping check dhcp-rate
Parameters
| Parameter | Description | Value |
|---|---|---|
| rate | Specifies the maximum rate of sending DHCP messages to the processing unit. | The value is an integer that ranges from 1 to 100, in pps. |
| vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> | Specifies the maximum rate of sending DHCP messages
from a specified VLAN to the processing unit.
If this parameter is not specified, the command takes effect on all the DHCP messages. |
The value is an integer that ranges from 1 to 4094. |
Views
System view, VLAN view, GE interface view, XGE interface view, Eth-Trunk interface view, port group view
Usage Guidelines
Usage Scenario
After DHCP snooping is enabled, the device sends all the received DHCP Request messages and Reply messages to the processing unit. If the rate of sending DHCP messages is high, processing efficiency of the processing unit is affected. After the device is enabled to check the rate of sending DHCP messages to the processing unit, run the dhcp snooping check dhcp-rate command to set the maximum rate of sending DHCP messages to the processing unit. DHCP messages that exceed the rate are discarded.
Prerequisites
The device has been enabled to check the rate of sending DHCP messages to the processing unit using the dhcp snooping check dhcp-rate enable command.
Precautions
If the maximum rates of sending DHCP messages to the processing unit are set in the system view, VLAN view, and interface view, the smallest value takes effect.
