Reference Guide

Figure 44. ARP Learning via ARP Request
When you enable ARP learning via gratuitous ARP, the system installs a new ARP entry, or updates an existing entry for all
received ARP requests.
Figure 45. ARP Learning via ARP Request with ARP Learning via Gratuitous ARP Enabled
Whether you enable or disable ARP learning via gratuitous ARP, the system does not look up the target IP. It only updates the
ARP entry for the Layer 3 interface with the source IP of the request.
Configuring ARP Retries
The number of ARP retries is user-configurable.
The default backoff interval remains at 20 seconds.
To set and display ARP retries, use the following commands.
● Set the number of ARP retries.
CONFIGURATION mode
arp retries number
The default is 5.
The range is from 1 to 20.
● Set the exponential timer for resending unresolved ARPs.
CONFIGURATION mode
arp backoff-time
The default is 30.
The range is from 1 to 3600.
● Display all ARP entries learned via gratuitous ARP.
EXEC Privilege mode
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IPv4 Routing