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Configuring Static ARP Entries
ARP dynamically maps the MAC and IP addresses, and while most network host support dynamic
mapping, you can configure an ARP entry (called a static ARP) for the ARP cache.
To configure a static ARP entry, use the following command.
• Configure an IP address and MAC address mapping for an interface.
CONFIGURATION mode
arp ip-address mac-address interface
– ip-address: IP address in dotted decimal format (A.B.C.D).
– mac-address: MAC address in nnnn.nnnn.nnnn format.
– interface: enter the interface type slot/port information.
Example of the show arp Command
These entries do not age and can only be removed manually. To remove a static ARP entry, use the no
arp ip-address
command.
To view the static entries in the ARP cache, use the show arp static command in EXEC privilege
mode.
Dell#show arp
Protocol Address Age(min) Hardware Address Interface VLAN CPU
--------------------------------------------------------------------------------
Internet 10.1.2.4 17 08:00:20:b7:bd:32 Ma 1/0 - CP
Dell#
Enabling Proxy ARP
By default, Proxy ARP is enabled. To disable Proxy ARP, use the no ip proxy-arp command in the
interface mode.
To re-enable Proxy ARP, use the following command.
• Re-enable Proxy ARP.
INTERFACE mode
ip proxy-arp
To view if Proxy ARP is enabled on the interface, use the show config command in INTERFACE mode. If
it is not listed in the
show config command output, it is enabled. Only non-default information is
displayed in the show config command output.
Clearing ARP Cache
To clear the ARP cache of dynamically learnt ARP information, use the following command.
• Clear the ARP caches for all interfaces or for a specific interface by entering the following information.
EXEC privilege
clear arp-cache [interface | ip ip-address] [no-refresh]
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IPv4 Routing