Configuring Arp Packet Rate Limit; Configuration Guidelines; Configuration Procedure - HP 5920 Series Configuration Manual

Configuration procedure

# Enable ARP source suppression and set the threshold to 100.
<Device> system-view
[Device] arp source-suppression enable
[Device] arp source-suppression limit 100
# Enable ARP blackhole routing.
[Device] arp resolving-route enable

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, you can
configure ARP packet rate limit.

Configuration guidelines

Configure this feature when ARP detection, ARP snooping, or MFF 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 receiving rate of ARP
packets on the interface exceeds the rate limit, those packets are discarded.
You can enable sending 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 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
1. Enter system view.
2. (Optional.) Enable notification
sending for ARP packet rate
limit.
3. (Optional.) Enable logging for
ARP packet rate limit.
(Optional.) Set the notification
4.
and log message sending
interval.
Command
system-view
snmp-agent trap enable arp
[ rate-limit ]
arp rate-limit log enable
arp rate-limit log interval
seconds
329
Remarks
N/A
By default, notification sending for
ARP packet rate limit is disabled.
By default, logging for ARP packet
rate limit is disabled.
By default, the device sends
notifications and log messages at an
interval of 60 seconds.