FAQ What Does Incomplete Mean in an ARP Entry?

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If the value of MAC ADDRESS in an ARP entry is Incomplete, this ARP entry is a temporary one. When IP packets trigger ARP Miss messages, a device generates a temporary ARP entry and sends ARP Request packets to the destination network segment.
  • Before the temporary ARP entry is aged out:
    • If the device has not received any ARP Reply packet, the device discards the IP packets matching the temporary ARP entry and does not trigger any ARP Miss message.
    • If the device has received an ARP Reply packet, the device generates a correct ARP entry to replace the temporary entry.
  • After the temporary ARP entry ages out, the device deletes this entry.
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