Configuring Port State Auto Recovery; Rate Limit Configuration Example - 3Com 5500-EI PWR Install Manual

To do...
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.

Configuring Port State Auto Recovery

Follow these steps to configure port state auto recovery:
To do...
Enter system view
Enable port state auto-recovery
Configure the port state
auto-recovery interval

Rate Limit Configuration Example

Network requirements
As shown in Figure
Ethernet 1/0/2 is connected to client B and Ethernet 1/0/11 is connected to client A.
Enable DHCP snooping on the switch, and specify Ethernet 1/0/1 as the DHCP snooping trusted
port.
Use the command...
interface interface-type
interface-number
dhcp rate-limit enable
dhcp rate-limit rate
dhcp protective-down
recover enable
dhcp protective-down
recover interval interval
Use the command...
system-view
dhcp protective-down
recover enable
dhcp protective-down
recover interval interval
5-1, Ethernet 1/0/1 of the S5500-EI switch is connected to the DHCP server.
—
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.
—
Required
By default, this function is
disabled.
Optional
By default, the auto-discovery
interval is 300 seconds.
5-2
Remarks
Remarks