ARP Table

With the ARP Table window, you can:

• Display and remove all addresses in Address Resolution Protocol (ARP) Table.
• Change the ARP cache timeout value.

ARP determines the MAC address of a host by locating its IP address in a table.

Displaying and Removing Addresses in the ARP Table

The ARP Table automatically maps the IP address to the MAC address of a switch. In addition to address information, the table shows the age of the entry in the table, the encapsulation method, and the switch interface (VLAN ID) where packets are forwarded. For example, the first entry in the sample ARP table below indicates that 180 minutes ago a switch with a MAC address of 0050.53f6.1240 was mapped to the Internet address 172.17.93.161 using ARPA encapsulation. The switch belongs to VLAN 1.

To clear all entries from the ARP table, click Remove All.

Note: You can manually add entries to the ARP table from the command-line interface; however, entries added manually do not age and must be removed manually.

Changing the ARP Cache Timeout Value

You can specify the amount of time before ARP entries are aged and removed from the ARP table.

To change the ARP timeout value:

1. In the ARP Cache Timeout Value field, enter a number from 1 to 4294967.
   The default value is 14400 seconds.
2. Click OK to save your changes to nonvolatile memory and close the window.