Arp Learning Via Arp Request; Configuring Arp Retries - Dell Z9500 Configuration Manual

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ARP Learning via ARP Request

In Dell Networking OS versions prior to 8.3.1.0, Dell Networking OS learns via ARP requests only if the target IP specified in the

packet matches the IP address of the receiving router interface. This is the case when a host is attempting to resolve the

gateway address.

If the target IP does not match the incoming interface, the packet is dropped. If there is an existing entry for the requesting

host, it is updated.

Figure 52. 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 53. 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.

You can configure the number of ARP retries.

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

IPv4 Routing