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Why do all ports in storage ARP tables show the same identical MAC address

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ontap-9
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Applies to

  • ONTAP 9
  • Arista switch pairs

Answer

  • Example:
netapp01::*> arp active-entry show -node netapp01_01 -vserver netapp -mac aa:bb:cc:dd:ee:ff
  (network arp active-entry show)

Node: netapp01_01
Vserver: netapp
Subnet Group: 0.0.0.0/0
Remote
IP Address         MAC Address       Port
----------------- ----------------- -------
172.16.100.10     aa:bb:cc:dd:ee:ff e2a

172.16.100.20     aa:bb:cc:dd:ee:ff e2b

172.16.100.40     aa:bb:cc:dd:ee:ff e2c

172.16.100.60     aa:bb:cc:dd:ee:ff e2d

172.16.100.80     aa:bb:cc:dd:ee:ff e2e
  • This is expected when VARP is configured in the Arista switches.
  • When the router sends an ARP request for an IP address in a virtual subnet, the ARP request will use the virtual IP address as the source IP address and the virtual MAC address as the source MAC address inside the ARP header.

Additional Information

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