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VMs intermittent loses network connectivity


VMs intermittent loses network connectivity

VMs intermittent loses network connectivity



We are experiencing intermittent VM disconnects that we have to resolve by doing vMotion to another host. We have also experienced packet drops on some VMs in the past. Not sure how common it is right now.


Our basis are HP ProLiant 460c G9 server in C7000 Enclosures.


The main issues is, that we can't nail down the root cause as it is intermittent. It is happening in our production environment and for that reason we can't do a deep troubleshooting and in most cases we need to vMotion the VM to get it back to work.


We have involved VMware and HPE but both are thinking that the issues is related to a network problem in the data centre network switches and is a layer 2 issue, somehow related to MAC address issues or duplicate MAC Addresses.


We are not in control of the DC Network switches for that reason we decided to tackle the issues from the server side onwards, to eliminate involved components one by one.


The start of the happenings could not be exactly fixed to one or the other action we took to keep the VMware environment in a supported status.


It seems that the first time we saw it was with the following setup:



  • OA                                          4.70
  • VC                                          4.60
  • Blade Bios                             I36 - 02-17-2017
  • FLB650 Firmware                11.2.1226.20
  • FLB650 Driver                      11.2.1149.0
  • ESXi-Build 6.0.U3d             5572656



We did some research and updated in single steps to the versions below.



Current Setup:

  • OA                                          4.70
  • VC                                          4.60
  • Blade Bios                             I36 - 25-10-2017
  • FLB650 Firmware                11.2.1263.19
  • FLB650 Driver                      11.2.1149.0
  • ESXi-Build 6.0.U3d             6921384



Is looks like the amount of failures has decreased, but we are not 100% sure, as the failure is intermittent.


So far no we could not find any final solution from anybody, for that reason we decided the do a step by upgrade using the following steps and try to finally solve the issue.



Future Setup:

  • OA                                          4.70
  • VC                                          4.62
  • Blade Bios                             I36 - 01-22-2018
  • FLB650 Firmware                11.4.1223.x
  • FLB650 Driver                      11.4.1210.0
  • ESXi-Build 6.0.U3d             6921384



HPE has released VC Firmware 4.62 and SPP 03.2018, but the HPE has not committed that there is an issue, a fix or solution is not mentioned in the release notes.


To keep the setup in a supported condition we do not really have another chance then to proceed this way.


By the way the mentioned supported bios/firmware is nit available for download in all sites we searched for it, and at least it is a very old version,


The newer released versions should fix the issue anyway.


Our next steps are:



  1. Verify if the amount of failures has really decreased
  2. Update to VC firmware 4.62 and check if the failure is gone
  3. Update to SPP 03.2018 and check if the failure is gone



We keep you posted about the outcome.



Any feedback and suggestions are welcome.



Best Regards





Re: VMs intermittent loses network connectivity

Hello All,


sorry for any inconvenience caused, but we need to postpone our upgrade activities for one week.


Our customer has released a change freeze und due to that we can't go forward right now.






Keep you posted about our progress.


Re: VMs intermittent loses network connectivity

We will start our update activity on the 20th of match 2018. we will start updating to SSP 2018-03 to eliminate the Onboard NIC (FLB650) as the root cause. The second step will be to update the VC firmware to 4.62 to see if we are further improving.

Keep you posted about the outcome.