Symptom
Incomplete ARPs entries can occur randomly after a Nexus 3000 switch is reloaded.
To verify this condition check if the following counter is incrementing -
sh ip arp statistics vlan 2000 interface-all
ARP packet statistics for interface: Vlan2000
...
Received:
Total 24576, Requests 0, Replies 0, Requests on L2 0, Replies on L2 0
Proxy arp 0, Local-Proxy arp 0, Tunneled 0, Fastpath 0, Snooped 0, Dropped 24576
Received packet drops details:
Appeared on a wrong interface : 24576 <<<<<<<<<<<<<<<<<<<<<<<<< This is incrementing
You may also see syslogs message like
%ARP-3-REQ_NON_AM: arp [3393] Sending ARP request for X.X.X.X on invalid interface VlanXXX request from pid: XXXX
Conditions
After reloading the switch.
Workaround
We can try bouncing the SVI and if this does not recover it then reload the switch again.
