ARP/NDP Timer Settings

The Address Resolution Protocol (ARP) or the Neighbor Discovery Protocol (NDP) timer specifies the aging time on the IP interface. The ARP timer is used for IPv4 addresses and the NDP timer is used for IPv6 addresses. The timer is configurable from 3 to 30 seconds. The default is 30 seconds. When an IP interface is configured, ARP/NDP requests are sent to the IP interface to find the gateway MAC address. In response, the gateway sends an ARP/NDP reply. The control card tries to match the IP address of the IP interface with the IP address of the ARP/NDP message received. If a match is found, the ARP/NDP status changes to resolved (otherwise the ARP/NDP status is not resolved).

Once the ARP/NDP status is resolved, the ARP/NDP timer of the IP interface controls the interval at which an ARP/NDP request is sent to the gateway to detect if the gateway is reachable or not.

You must enable the IP Gateway Status SNMP trap to send SNMP notifications when the ARP/NDP status changes. To enable SNMP notifications, refer to Enable or Disable Events for SNMP Notifications.

Change the ARP/NDP Timer Settings

The default ARP/NDP timer value is 30 seconds. To change the timer setting at the node-level:

1.

On the top navigation pane, click Physical.

2.

In the Physical Nodes page, select the node for which you want to change the ARP/ NDP timer setting.

3.

Go to Settings > Global Settings > ARP/NDP.

4.

Click Settings.

5.

In the ARP/NDP Settings page, choose the required ARP Refresh Time Interval or the NDP Refresh Time Interval in seconds.

6.

Click OK.

The ARP Entries table and the IPv6 Neighbor Entries table dynamically refresh to display information such as the IP address and Hardware address mapping, aging, state, and interface details.

Click Clear > Clear ARP Entries or Clear > Clear IPv6 Neighbor Entries to remove the entries from the tables.