Deployment Guide

• ARP Learning via Gratuitous ARP
• ARP Learning via ARP Request
• Conguring ARP Retries
Conguring Static ARP Entries
ARP dynamically maps the MAC and IP addresses, and while most network host support dynamic mapping, you can congure an ARP
entry (called a static ARP) for the ARP cache.
To congure a static ARP entry, use the following command.
• Congure 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 10.11.68.14 94 00:01:e9:45:00:03 Ma 0/0 - CP
Internet 10.11.209.254 0 00:01:e9:45:00:03 Ma 0/0 - CP
Dell#
Enabling Proxy ARP
By default, Proxy ARP is enabled. To disable Proxy ARP, use the no 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 specic interface by entering the following information.
EXEC privilege
clear arp-cache [interface | ip ip-address] [no-refresh]
• ip ip-address (OPTIONAL): enter the keyword ip then the IP address of the ARP entry you wish to clear.
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IPv4 Routing