NSX-T Edge Node pNIC Down False Positive Alerts in Aria Operations for Networks

Products

• VMware NSX
• VMware Aria Operations (formerly vRealize Operations) 8.x
• VMware vSphere ESXi

Issue/Introduction

• Aria Operations for Networks reports repeated critical alerts: "Operations for Networks-NSX-T Edge Node Pnic Status is 'Down'".
• No actual traffic impact or dataplane interruption is observed on the affected Edge node.
• Log analysis reveals NETOPA00006 errors in the netopa logs.
• The ESXi vmkernel logs for the host where the Edge resides show "CPUID Admission failure in path: host/vim/vmvisor/nsx-datapath-ctrs".

Environment

• VMware NSX
• VMware Aria Operations (formerly vRealize Operations)
• VMware vSphere ESXi

Cause

The alert is a false positive triggered by CPU resource contention at the ESXi host level. The netopa agent (responsible for exporting network telemetry to Aria) requires resources from the nsx-datapath-ctrs resource pool.

 

When the hypervisor host is overcommitted or experiencing high CPU contention, the scheduler may deny CPU admission to this pool. This causes the telemetry agent to time out (NETOPA00006) when reporting to Aria. Aria interprets the missing heartbeat/telemetry as a physical adapter failure.

Resolution

Hardware or physical network remediation is typically not required. Instead, address the host-level resource starvation:

 

1. Identify Resource Contention: Access the affected ESXi host and run 'esxtop'. Monitor the Edge VM and system resource groups for high CPU Ready (%RDY) or Co-Stop (%CSTP).
2. Workload Re-balancing: Reduce host CPU load by migrating other virtual machines to different hosts in the cluster via vMotion.
3. Edge VM Right-Sizing: Verify that the Edge VM vCPU configuration matches the actual workload requirements. Over-provisioning vCPUs can lead to increased scheduling wait times (Co-Stop) which affects management agent performance.
4. Restart Management Agents: If contention has been resolved but alerts persist, restart the host management agents to refresh system reservations:
   1. /etc/init.d/hostd restart
   2. /etc/init.d/vpxa restart

Additional Information

While the physical network is not impacted, these false positives can mask real hardware failures if left unaddressed. Prolonged CPU admission failure for NSX system processes may also affect other management plane functions

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