Intermittent Connectivity Loss when using a Broadcom Smart Load Balancing Team with Hyper-V in Windows Server 2008 R2


Intermittent Connectivity Loss when using a Broadcom Smart Load Balancing Team with Hyper-V in Windows Server 2008 R2





Article Summary: This article provides information on creating a Broadcom Smart Load Balancing and Failover team for use with Hyper-V on a Windows Server 2008 R2 server.


Issue:

After a Smart Load Balancing (SLB) & Failover team is created with the Broadcom Advanced Control Suite (BACS) on a Windows 2008 R2 server with the Hyper-V role installed, network connectivity drops approximately every 15 seconds. In addition, the following errors appear in the host server's System event log:
  • Event ID 25 from source VMSMP:
    The MAC address xx-xx-xx-xx-xx-xx has moved from port y to port z.
  • Event ID 28 from source VMSMP:
    Port y was prevented from using MAC address xx-xx-xx-xx-xx-xx because it is pinned to port z.

Solution:

For an SLB team to work correctly with Hyper-V installed, BACS must be configured not to load balance - in other words, every adapter in the team except one must be configured as standby members. In addition, the Hyper-V Mode option must be enabled for the team. To so this, perform the following steps:
  1. Install the latest versions of the Broadcom drivers and BACS.
  2. Create an SLB team within BACS, configuring all but one of the adapters as standby members.
  3. Ensure Hyper-V mode is enabled, either by checking the corresponding box during team creation or by adding the following registry key:
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ Blfp\Parameters\1] "HyperVMode"=dword:00000001
  4. Reboot the server.
  5. Create an external virtual network through Hyper-V Virtual Network Manager and bind it to the team that was just created.
  6. Configure VMs to use the new virtual network.



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Article ID: SLN286000

Last Date Modified: 09/21/2019 05:30 AM

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