Configuring Dhcp Packet Rate Limit; Rate Limit Configuration Example - 3Com 4210 9-Port Configuration Manual

Configuring DHCP Packet Rate Limit

Configuring DHCP Packet Rate Limit
Follow these steps to configure rate limit of DHCP packets:
Operation
Enter system view
Enter port view
Enable the DHCP packet rate
limit function
Configure the maximum DHCP
packet rate allowed on the port
Enable the port state
auto-recovery function
Set the port state
auto-recovery interval
Enable the port state auto-recovery function before setting the auto-recovery interval.
You are not recommended to configure DHCP packet rate limit on the ports of an aggregation
group.

Rate Limit Configuration Example

Network requirements
As shown in Figure
connected to client B and Ethernet1/0/11 is connected to client A.
Enable DHCP snooping on the switch, and specify Ethernet1/0/1 as the DHCP snooping trusted
port.
Configure DHCP packet rate limit on Ethernet1/0/11 and set the maximum DHCP packet rate
allowed on the port to 100 pps.
Set the port state auto-recovery interval to 30 seconds on the switch.
system-view
interface interface-type
interface-number
dhcp rate-limit enable
dhcp rate-limit rate
dhcp protective-down
recover enable
dhcp protective-down
recover interval interval
4-1, Ethernet1/0/1 of the switch is connected to the DHCP server. Ethernet1/0/2 is
Command
4-2
Description
—
—
Required
By default, DHCP packet rate
limit is disabled.
Optional
By default, the maximum rate is
15 pps.
Optional
By default, the port state
auto-recovery function is
disabled.
Optional
The port state auto-recovery
interval is 300 seconds.