SDDC Manager add host to cluster fails with error "Vmotion network not found in the network pool"

Products

• VMware Cloud Foundation
• VMware SDDC Manager

Issue/Introduction

• Adding a new host to the management WL domain cluster via a json file fails with "Failed to validate cluster spec for {0} with errors {1}".
• Error in SDDC Manager UI

  Generate ESXi Host(s) Addition Input Data
  
  Description    Generate ESXi Host(s) Addition Input Data
  Progress Messages    Failed to validate cluster spec for {0} with errors {1}
  Error Message: Failed to validate cluster spec for {0} with errors {1}
  Remediation Message:
  Reference Token: #####
  
  Cause: Vmotion network not found in the network pool.

• Error in /var/log/vmware/vcf/domainmanager/domainmanager.log

  ERROR [vcf_dm,##############,7aa6] [c.v.e.s.o.model.error.ErrorFactory,dm-exec-6]  [ITI6G4] PUBLIC_CLUSTERSPEC_VALIDATION_FAILED Failed to validate Network parameters for hosts
  com.vmware.evo.sddc.orchestrator.exceptions.OrchTaskException: Failed to validate Network parameters for hosts
      at com.vmware.evo.sddc.common.services.VmknicConfigGenerator.generateHostVmknicMapping(VmknicConfigGenerator.java:178)
      at com.vmware.vcf.hostmanager.action.header.GenerateAddHostInternalModelAction.execute(GenerateAddHostInternalModelAction.java:169)
      at com.vmware.vcf.hostmanager.action.header.GenerateAddHostInternalModelAction.execute(GenerateAddHostInternalModelAction.java:53)
      at com.vmware.evo.sddc.orchestrator.platform.action.FsmActionState.invoke(FsmActionState.java:62)
      at com.vmware.evo.sddc.orchestrator.platform.action.FsmActionPlugin.invoke(FsmActionPlugin.java:159)
      at com.vmware.evo.sddc.orchestrator.platform.action.FsmActionPlugin.invoke(FsmActionPlugin.java:144)
      at com.vmware.evo.sddc.orchestrator.core.ProcessingTaskSubscriber.invokeMethod(ProcessingTaskSubscriber.java:400)
      at com.vmware.evo.sddc.orchestrator.core.ProcessingTaskSubscriber.processTask(ProcessingTaskSubscriber.java:520)
      at com.vmware.evo.sddc.orchestrator.core.ProcessingTaskSubscriber.accept(ProcessingTaskSubscriber.java:124)
      at jdk.internal.reflect.GeneratedMethodAccessor758.invoke(Unknown Source)
      at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.base/java.lang.reflect.Method.invoke(Method.java:566)
      at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:88)
      at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:73)
      at org.springframework.cloud.sleuth.instrument.async.TraceRunnable.run(TraceRunnable.java:68)
      at org.springframework.cloud.sleuth.instrument.async.TraceRunnable.run(TraceRunnable.java:68)
      at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
      at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
      at java.base/java.lang.Thread.run(Thread.java:829)
  Caused by: com.vmware.evo.sddc.orchestrator.exceptions.OrchTaskException: Vmotion network not found in the network pool
      at com.vmware.evo.sddc.common.services.VmknicConfigGenerator.generateHostVmknicMapping(VmknicConfigGenerator.java:90)
      ... 18 common frames omitted

• vMotion Network pool in SDDC Manager (Administration > Network settings) has no Default Gateway configured

Cause

vMotion Network in SDDC Network pool has no default gateway address configured

Resolution

Please open a ticket with Broadcom Support. 

Additional Information