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Cisco Bug: CSCur01470 - N5K/6K fails to respond to unicast ARP request and may loop it back

Last Modified

Sep 11, 2019

Products (8)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

7.0(1)N1(1) 7.2(0)N1(0.38)

Description (partial)

Unicast ARP requests for HSRP address coming into HSRP active VPC switch over the peer-link does not get responded to by. In certain conditions, the HSRP unicast ARP request can also get looped back on the vPC it came in on causing downstream switches to register a MAC flap.

N5K/6Ks are in VPC topology and HSRP configured on them.
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