How to Reset ARP Table?

To reset the ARP table, you can use the reset arp command with specific options to clear ARP entries.

The ARP (Address Resolution Protocol) table maps IP addresses to MAC addresses. Resetting it can be useful for troubleshooting network connectivity issues or clearing out old entries. The command and its options depend on the network device you're using. Based on the provided reference (HPE switches), here's how to reset the ARP table:

Resetting the ARP Table on HPE Switches

The general command structure is:

reset arp { all | dynamic | interface interface-type interface-number | multiport | slot slot-number | static }

Here's a breakdown of the options:

Option	Description
all	Clears all ARP entries from the table.
dynamic	Clears only the dynamically learned ARP entries.
interface interface-type interface-number	Clears ARP entries associated with a specific interface.
multiport	Clears all multiport ARP entries.
slot slot-number	Clears ARP entries associated with a specific slot.
static	Clears all statically configured ARP entries.

Examples

• Clear all ARP entries:

  reset arp all

  This command clears the entire ARP table, including both dynamic and static entries.

• Clear only dynamic ARP entries:

  reset arp dynamic

  This command removes only the entries that were learned dynamically by the device.

• Clear ARP entries for a specific interface:

  reset arp interface vlan-interface 10

  This command clears ARP entries associated with VLAN interface 10. (Note: vlan-interface 10 is an example; replace with your actual interface type and number.)

• Clear all multiport ARP entries:

  reset arp multiport

  This command clears ARP entries that relate to multiport configurations.

Important Considerations

• Clearing the ARP table can temporarily disrupt network connectivity, as the device needs to re-learn the IP-to-MAC address mappings.
• Use the reset arp command with caution, especially in production environments. Consider the potential impact on network traffic.
• The specific command and options may vary slightly depending on the exact model and software version of your network device. Always refer to the device's documentation for the most accurate information.