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Displaying Dynamically Learned ARP Entries
The ARP cache contains entries that map IP addresses to the corresponding
physical address. The ARP cache contains static entries, and entries for local
interfaces, including subnet, host, and broadcast addresses. Most of these entries will
be dynamically learned through replies to broadcast messages. You can display all of
the dynamic entries in the ARP cache, change specific dynamic entries into static
entries, or clear all dynamic entries from the cache.
Command Attributes
• IP Address – IP address of a dynamic entry in the cache.
• MAC Address – MAC address mapped to the corresponding IP address.
• Interface – VLAN interface associated with the address entry.
• Dynamic to Static
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– Changes a selected dynamic entry to a static entry.
• Clear All
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– Deletes all dynamic entries from the ARP cache.
• Entry Count – The number of dynamic entries in the ARP cache.
The following field is also displayed in the CLI.
• Type – Indicates if entries were learned through replies to broadcast messages,
are statically configured entries, or are other entries for local interfaces (including
subnet and broadcast addresses).
19. These buttons take effect immediately. You are not prompted to confirm the action.
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CLI -
This example sets a static entry for the ARP cache.
Console(config)#arp 10.1.0.11 00-11-22-33-44-55
Console(config)#exit
Console#show arp
Arp cache timeout: 1200 (seconds)
IP Address MAC Address Type Interface
--------------- ----------------- --------- -----------
192.168.0.4 00-E0-29-94-34-1C dynamic 1
10.1.0.11 00-11-22-33-44-55 static 2
Total entry : 2
Console(config)#
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2
IP Routing
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