ESXi host is reporting "Faulty TEP" alert on the NSX UI

Products

• VMware NSX

Issue/Introduction

- When workloads are moved to ESXi Transport Node the TEP (Tunnel Endpoint) status shows Tunnels towards Host to Host and Edges as down.
- TEP tunnel failures between ESXi host to hosts and Edge nodes.
- The host is only forming BFD session with VMK11 and not with VMK10.

Environment

VMware NSX

Cause

- We identified the connectivity issue is present only on one of the VMNIC and failing to form BFD session with host to host and edge nodes.

Resolution

- We referred this KB article and validated the Inter-vlan routing is good -- https://knowledge.broadcom.com/external/article?articleNumber=405174

-  To resolve vmnic issue we manually flapped the problematic uplink vmnic# by running the below command.

esxcli network nic down -n vmnic#  --> This puts the interface vmnic# down
esxcli network nic up -n vmnic#   --> This gets the interface vmnic# up