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Configuring Static ARP Addresses
For devices that do not respond to ARP requests or do not respond in a timely
manner, traffic will be dropped because the IP address cannot be mapped to a
physical address. If this occurs, you can manually map an IP address to the
corresponding physical address in the ARP cache.
Command Usage
• The ARP cache is used to map 32-bit IP addresses into 48-bit hardware (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 cache.
• A static entry may need to be used if there is no response to an ARP broadcast
message. For example, some applications may not respond to ARP requests or
the response arrives too late, causing network operations to time out.
• Static entries will not be aged out or deleted when power is reset. You can only
remove a static entry via the configuration interface.
Command Attributes
• IP Address – IP address statically mapped to a physical MAC address. (Valid IP
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 Addresses
19-11
Address Resolution Protocol
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