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Cisco Bug: CSCvh68593 - Egress port for ARP is not updated after re-enabling MAC Learning in Nexus 9000

Last Modified

Oct 08, 2019

Products (52)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3132Q-V Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 93108TC-FX Switch
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Known Affected Releases

7.0(3)I6(2) 7.0(3)I7(2) 7.0(3)I7(3)

Description (partial)

A Nexus 9000 (any N9K) running i7(2) migt not update the egress port of an arp entry after the mac learning process is re-enabled. This is commonly seen during a Firewall failover in which a gratuitous arp is expected to update the ARP entry and point all the traffic to the new active Firewall

1) Nexus 9000 using CloudScale ASIC
2) The mac learning process should be disabled and re-enabled
3) After re-enabling the mac learning process, the arp and mac entries should point to different phy interfaces
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