NSX-T Segment creation fails with "Failed to find a vni pool" error
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NSX-T Segment creation fails with "Failed to find a vni pool" error

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Article ID: 322603

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Updated On:

Products

VMware NSX Networking

Issue/Introduction

Symptoms:
  • Overlay segment creation fails with the error "Failed to find a vni pool".
  • When navigating to NSX-T UI > System > Fabric > Profiles > Configuration , one or both of the Default VNI pools, shows no value i.e. no VNI range.
  • You some time in the past renamed the one or both of the Default VNI pool names.
  • The Default VNI pool names are:
    • Default Vni Pool-1
    • Default Vni Pool-2
  • Checking logs in /var/log/syslog.log, you can see similar messages : 
2022-xx-xx:33:01.805Z nsxt-mgr.vmw.com NSX 5528 SWITCHING [nsx@6876 comp="nsx-manager" errorCode="MP8301" level="ERROR" subcomp="manager"] LogicalSwitch segment_test create failed since vni pool cannot be found


Environment

VMware NSX-T Data Center
VMware NSX-T Data Center 3.x

Cause

Segment realization fails if the vni pool names are changed from the default value "Default Vni Pool-1" and "Default Vni Pool-2".

Resolution

This is resolved in NSX-T data center 3.2.1 available at VMware downloads.

Workaround:
If you have changed the default VNI pool names, lease revert the names to the original default vlaues:
  • Default Vni Pool-1
  • Default Vni Pool-2
If you have not changed the default VNI pool names or you are prevented from changing the name back to the default name(s) now, as you are on NSX-T 3.2.1 or greater, please open a Support Request (refer to KB article "How to file a Support Request in Customer Connect" https://kb.vmware.com/s/article/2006985) and refers to this KB article.