Traceflow attempt in NSX GUI fails with " Traceflow on VLAN logical port InternalLogicalPort/<portID> requires INT (In-band Network Telemetry) to be enabled."

Products

• VMware NSX

Issue/Introduction

• Below error message is observed when performing traceflow for vlan backed segments.

Traceflow request failed. The request might be cancelled because it took more time than normal. Please retry. Error Message: Traceflow intent /infrattraceflows/<xxx> realized on enforcement point /infraisitesidefault/enforcernent-points/default with error Traceflow does not support vlan switch for port: LogicalPort/<>/infra/segments/dvportgroup-<>/ports/default:<>

 

Environment

VMware NSX-T Data Center

VMware NSX

Cause

By default, Traceflow within NSX is available only for NSX-T overlay segments
Performing Traceflow for VLAN Backed segments is not supported in current versions.

Resolution

Additional features have been enabled that allow Traceflow for VLAN-Backed Networks. This is accomplished by enabling In-band Network Telemetry (INT).

Reference:

 
Steps to enable In-band Network Telemetry (INT) to trace VLAN backed network.

 

1. GET https://<nsx mgr>/policy/api/v1/infra/ops-global-config
    
   Sample Lab output:
    
   
   Make a note of the _revision as we will use this for your next call.
   Make a new call with the following information:
    
2. PUT https://<nsx mgr>/policy/api/v1/infra/ops-global-config
 
Body:
{
    "display_name": "ops-global-config",
    "in_band_network_telementry": {
        "dscp_value": 2,
        "indicator_type": "DSCP_VALUE"
    },
    "path": "/infra/ops-global-config",
    "relative_path": "ops-global-config",
    "_revision": 0
}
   
   Traceflow passes through for the same vlan-backed segment post enabling In-band Network Telemetry (INT).
   

 

Additional Information

Click here for additional information for Troubleshooting NSX Traceflow.

If you are contacting Broadcom support about this issue, please provide the following:

• NSX Edge log bundles for affected Edges in the Edge Cluster
• Ensure log date range covers the full date of the event(s) being investigated. When in doubt, retrieve logs for all time.
• NSX Manager log bundles
• ESXi host log bundles for all hosts supporting affected Edge VMs
• Text of any error messages seen in NSX GUI or command lines pertinent to the investigation

Handling Log Bundles for offline review with Broadcom support

• Collect Support Bundles for Troubleshooting NSX-T
• Uploading files to cases on the Broadcom Support Portal
• Creating and managing Broadcom support cases