Setting The Aging Timer For Dynamic Arp Entries; Enabling Dynamic Arp Entry Check; Enabling Arp Logging - HP FlexNetwork MSR2003 Configuration Manual

Setting the aging timer for dynamic ARP entries

Each dynamic ARP entry in the ARP table has a limited lifetime, called an aging timer. The aging
timer of a dynamic ARP entry is reset each time the dynamic ARP entry is updated. A dynamic ARP
entry that is not updated before its aging timer expires is deleted from the ARP table.
To set the aging timer for dynamic ARP entries:
Step
1. Enter system view.
2. Set the aging timer for
dynamic ARP entries.

Enabling dynamic ARP entry check

The dynamic ARP entry check function disables the device from supporting dynamic ARP entries
that contain multicast MAC addresses. The device cannot learn dynamic ARP entries containing
multicast MAC addresses. You cannot manually add static ARP entries containing multicast MAC
addresses.
When dynamic ARP entry check is disabled, ARP entries containing multicast MAC addresses are
supported. The device can learn dynamic ARP entries containing multicast MAC addresses obtained
from the ARP packets sourced from a unicast MAC address. You can also manually add static ARP
entries containing multicast MAC addresses.
To enable dynamic ARP entry check:
Step
1. Enter system view.
2. Enable dynamic ARP entry
check.

Enabling ARP logging

This function enables a device to log ARP events when ARP cannot resolve IP addresses correctly.
The device can log the following ARP events:
•
On a proxy ARP-disabled interface, the target IP address of a received ARP packet is not one of
the following IP addresses:
The IP address of the receiving interface.
The virtual IP address of the VRRP group.
The public IP address after NAT.
•
The sender IP address of a received ARP reply conflicts with one of the following IP addresses:
The IP address of the receiving interface.
The virtual IP address of the VRRP group.
The public IP address after NAT.
The device sends ARP log messages to the information center. You can use the info-center source
command to specify the log output rules for the information center. For more information about
information center, see Network Management and Monitoring Configuration Guide.
Command
system-view
arp timer aging aging-time
Command
system-view
arp check enable
5
Remarks
N/A
By default, the aging time for dynamic ARP
entries is 20 minutes.
Remarks
N/A
By default, dynamic ARP entry check is
enabled.