Configuring Static ARP Addresses
For devices that do not respond to ARP reque sts or do not r espond i n a timely
manner, traffic will be dropped because the IP address cannot be mapped to a
physical address. If this occurs, you can manua lly ma p an IP ad dress to the
corresponding physical address in the ARP cache.
Command Usage
• The ARP cache is used to map 32-bi t IP addr esse s in to 48- bit h ardwa re (that is ,
Media Access Control) addresses. This cache includes entries for hosts and other
routers on local network interfaces defined on this router.
• You can define up to 128 static entries in the ARP cac he.
• A static entry may need to be used if there is no response to an ARP broadc ast
message. For example, some applications may not re spond to ARP req uests or
the response arrives too late, causing network operations to time out.
• Static entries will not be aged out or deleted when power is rese t. You ca n only
remove a static entry via the configuration interface.
Command Attributes
• IP Address – IP address statically mapped to a physical MAC address. (Valid I P
addresses consist of four numbers, 0 to 255, separated by periods.)
•
MAC Address
– MAC address statically mapped to the corresponding IP address.
(Valid MAC addresses are hexadecimal numbers in the format: xx-xx-xx-xx-xx-xx.)
• Entry Count – The number of static entries in the ARP cache.
Web -
Click IP, ARP, Static Addresses. Enter the IP address, the corresponding
MAC address, and click Apply.
Figure 19-4 ARP Static Add resses

19-11

Address Resolution Protocol

19