Arp Table - Avaya G430 Manual

The router

ARP table

When you configure the Address Resolution Protocol (ARP) table, you can:
• View information about the ARP table
• Add entries to the ARP table
• Delete entries from the ARP table
• Configure the ARP timeout
Related topics:
Overview of ARP
Static and dynamic table entries
Adding static ARP table entries
Changing an entry in the ARP table
Summary of ARP table commands
Overview of ARP
IP logical network addresses are independent of physical addresses. The physical address
must be used to convey data in the form of a frame from one device to another. Therefore, a
mechanism is required to acquire a destination device hardware address from its IP address.
This mechanism is called ARP.
Static and dynamic table entries
The ARP table stores pairs of IP and MAC addresses. This storage saves time and
communication costs, since the host looks in the ARP table first when transmitting a packet.
If the information is not there, then the host sends an ARP Request.
There are two types of entries in the ARP table:
Static ARP table entries: Static ARP table entries do not expire.
Dynamic ARP table entries: Dynamic ARP table entries are mappings between IP addresses
and MAC addresses that the switch used recently. Dynamic ARP table entries expire after a
configurable amount of time. The following diagram shows how a switch adds dynamic ARP
table entries:
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October 2013