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Cisco Bug: CSCur20115 - Nexus 3500: ARP destined to peer's phy mac is dropped in non-vpc vlan

Last Modified

Sep 11, 2019

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases


Description (partial)

In the Nexus 3500 vPC setup, the switch drops ARP (reply) packets destined to the peer's physical MAC address.

Router1 has IP address
N3548A has IP address in vlan 99
N3548B has IP address in vlan 99
N3548A and N3548B has peer-link, peer-keepalive and a port-channel to carry non-vpc vlans between them.
Ping from N3548B to fails, as ARP is INCOMPLETE.

This issue occurs when Nexus 3500 is running one of the affected releases
The vPC peer-gateway is enabled

It is also seen when "peer-gateway exclude-Vlan <x>" is configured. In other words, the issue happens for non-vPC VLAN only.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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