Service Manual

Figure 53. ARP Learning via ARP Request
Beginning with Dell Networking OS version 8.3.1.0, 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 54. 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
You can configure the number of ARP retries.
The default backoff interval remains at 20 seconds. On the device, the time between ARP resend is
configurable. This timer is an exponential backoff timer. Over the specified period, the time between ARP
requests increases. This time increase reduces the potential for the system to slow down while waiting
for a multitude of ARP responses.
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.
IPv4 Routing
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