The arp packet payload command sets the payload length of ARP packets on an interface.
The undo arp packet payload command restores the default payload length of ARP packets on an interface.
By default, the payload length of ARP packets is not customized.
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Usage Scenario
An Ethernet frame in which an ARP packet is encapsulated in the payload is called an ARP frame. An ARP packet is only 28 bytes long. Data (payload) in an Ethernet frame is at least 46 bytes long. Padding bytes (payload of an ARP packet) need to be added behind the ARP packet to meet the requirement for the minimum data length.
If the payload lengths of ARP packets are different on two interconnected devices, ARP negotiation fails and ARP entries cannot be learned. To prevent this issue, configure the same payload length for ARP packets on both devices.