Chapter 63: Address Resolution Protocol (ARP)
968 Section X: Network Management
Overview
The switch has an Address Resolution Protocol (ARP) table. The switch
uses the table to store the MAC addresses of network devices and the
corresponding IP addresses of the devices. The switch refers to the table
to perform management functions that require that it communicate with
network devices, such as syslog servers, TFTP servers and Telnet or SSH
management workstations.
The entries in the table can be static or dynamic. Static entries are entries
you add to the table yourself. For instructions, refer to “Adding Static ARP
Entries” on page 969.
Dynamic entries are entries that the switch learns by itself whenever it
interacts with another network device when performing a management
function. The switch creates a dynamic entry after receiving a response to
an ARP broadcast packet that it sent to a network device whose IP
address is not in the table.
A dynamic entry remains in the table only if it is active. An entry remains
active so long as it is periodically used by the switch for management
functions. If an entry is inactive for a specified period of time, referred to as
ARP cache timeout, it is automatically removed from the table. The default
is 400 seconds. This value is not adjustable.
The switch supports up to 64 ARP entries per port.
Note
The switch must have an management IP address to support static
ARP entries. The IP addresses of the ARP entries must be
members of the same subnet as the management IP address. For
instructions, refer to Chapter 9, “IPv4 and IPv6 Management
Addresses” on page 201.
Note
The ARP entries are only used when the switch is performing a
management function that requires it to communicate with a device
on your network. The switch does not use the table to forward
network packets.
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