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Configuring ARP packet rate limit
The ARP packet rate limit feature allows you to limit the rate of ARP packets delivered to the CPU. An ARP
detection enabled device will send all received ARP packets to the CPU for inspection. Processing
excessive ARP packets will make the device malfunction or even crash. To solve this problem, configure
ARP packet rate limit.
Configuration guidelines
Configure this feature when MFF, ARP detection, or ARP snooping is enabled, or when ARP flood attacks
are detected.
Configuration procedure
This task sets a rate limit for ARP packets received on an interface. When the number of ARP packets that
the interface receives within a period exceeds the rate limit, those packets are discarded.
You can enable sending of notifications to the SNMP module or enable logging for ARP packet rate limit.
•
If notification sending is enabled, the device sends the highest threshold-crossed ARP packet rate
within the sending interval in a notification to the SNMP module. You must use the
snmp-agent
target-host
command to set the notification type and target host. For more information about
notifications, see
Network Management and Monitoring Command Reference
.
•
If logging for ARP packet rate limit is enabled, the device sends the highest threshold-crossed ARP
packet rate within the sending interval in a log message to the information center. You can
configure the information center module to set the log output rules. For more information about
information center, see
Network Management and Monitoring Configuration Guide
.
To configure ARP packet rate limit:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
(Optional.) Enable notification
sending for ARP packet rate
limit.
snmp-agent trap enable arp
[
rate-limit
]
By default, notification sending for
ARP packet rate limit is disabled.
3.
(Optional.) Enable logging for
ARP packet rate limit.
arp rate-limit log enable
By default, logging for ARP packet
rate limit is disabled.
4.
(Optional.) Set the notification
and log message sending
interval.
arp rate-limit log interval
seconds
By default, the device sends
notifications and log messages at an
interval of 60 seconds.
5.
Enter Layer 2 Ethernet
interface or Layer 2 aggregate
interface view.
interface
interface-type
interface-number
N/A
6.
Enable ARP packet rate limit
and configure the rate limit.
arp rate-limit
[
pps
]
By default, ARP packet rate limit is
enabled, and the rate limit is 100
pps.