Note: for Nested LAB the VTEP NIC teaming must be "failover"
You need to check what NSX Controller see in your LAB.
Lets say you connect VM1 and VM2 to VXLAN 5001.
VM1 ip 172.16.10.11
VM2 IP 172.16,10.12
find which controller manage VM1,VM2 VXLAN. (if you have 3 controller). SSH to one of your 3 NSX controller and type:
nvp-controller # show control-cluster logical-switches vni 5001
VNI Controller BUM-Replication ARP-Proxy Connections VTEPs
5001 192.168.110.201 Enabled Enabled 6 3
so now we know 192.168.110.201 is the controller that manage VXLAN 5001.
SSH to 192.168.110.201 and type:
nvp-controller # show control-cluster logical-switches arp-table 5001
VNI IP MAC Connection-ID
5001 172.16.10.11 00:50:56:a6:7a:a2 3
5001 172.16.10.12 00:50:56:a6:a1:e3 4
Does your controller in your lab know the IP/MAC/VXLAN of VM1 and VM2 ?