vCenter shows “Host network redundancy lost.”

• Scenario / Problem Statement: Alarm triggered that NIC redundancy is lost on a host.

• Diagnosis:

  1. Review host → Configure → Networking.

  2. Check number of active/standby uplinks.

  3. Validate physical switch port connectivity.

• Likely Cause: One physical NIC in a team is disconnected or switch port is down.

• Resolution: Reseat NIC cables, verify switch port config, re-enable redundancy.