tuanhoangth1603 commented on issue #10491:
URL: https://github.com/apache/cloudstack/issues/10491#issuecomment-2693845349

   Also, I recently upgraded from 4.19 to 4.20. All existing networks 
(including isolated networks) must have a redundant VR; otherwise, I cannot 
create any VMs for these networks, and the management log will show the 
following error:
   ```Unable to contact resource. 
com.cloud.exception.ResourceUnavailableException: Resource [DataCenter:1] is 
unreachable: Can't find all necessary running routers!``` 


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