When all NICs configured to be active on a vSwitch, the Failback setting is not applied
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When all NICs configured to be active on a vSwitch, the Failback setting is not applied

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Article ID: 341603

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction


Symptoms:

When all vmnics are configured to be active and Failback is enabled on the vSwitch, you see that the virtual machine does not return to the original vmnic after a recovery from a connection failover to another vmnic.


Environment

VMware vSphere ESXi 8.x
VMware vSphere ESXi 7.x
VMware vSphere ESXi 6.x

Resolution

The return of a vmnic to service does not necessarily return the traffic from virtual machines to the vmnic that were using it before it went down.

This is an expected behavior, the vmnic changes that occur after a device loss and recovery is as follows:

  1. Virtual machines power on with the configuration:

    Virtual_machine_1: Configured to vmnic2 on vSwitch1
    Virtual_machine_2: Configure to vmnic3 on vSwitch1
  2. If vmnic3 goes into a down state, you see these changes:

    Virtual_machine_1: Configured to vmnic2 on vSwitch1
    Virtual_machine_2: Configure to vmnic2 on vSwitch1


  3. When vmnic3 returns to an up (active) state, the virtual machine does not return to the original vmnic:

    Virtual_machine_1: Configured to vmnic2 on vSwitch1
    Virtual_machine_2: Configure to vmnic2 on vSwitch1
 
Note: When running an Active/Active configuration the failback setting does not apply


Additional Information