Network redundancy message when configuring vSphere High Availability in vCenter Server.

Products

• VMware vCenter Server
• VMware vSphere ESXi

Issue/Introduction

To prevent the Host <xxx> currently has no management network redundancy message when configuring the vSphere High Availability (HA) in vCenter Server, VMware recommends to add a second vmnic to the service console or management network vSwitch configured with NIC teaming, and that you keep both as active adapters, or place one in standby.

Symptoms:

When configuring the vSphere High Availability (HA) in vCenter Server, you see the message:

Host <xxx> currently has no management network redundancy

Environment

VMware vSphere ESXi 5.x
VMware vCenter Server 5.x
VMware vSphere ESXi 6.x
VMware vCenter Server 6.x

Cause

This message is displayed if the network redundancy configuration within the Service Console/VMkernel Port Management Network is incorrect. This message can be safely ignored.

Resolution

To prevent this message from appearing, and to comply with proper network redundancy, VMware recommends to add a second vmnic to the service console or management network vSwitch configured with NIC teaming, and that you keep both as active adapters, or place one in standby. For more information, see NIC teaming in ESXi and ESX (1004088).

Alternatively, you can add a second service console on a different vSwitch and subnet.<o></o> To suppress this message on ESXi and ESX hosts in the vSphere High Availability (HA) cluster, or if the warning appears for a host already configured in a cluster, set the VMware HA advanced option das.ignoreRedundantNetWarning to true and reconfigure VMware HA on that host. 

If the warning appears even when there are two available uplinks for the vSwitch hosting the Service Console/VMkernel Port Management Network, providing a redundancy, see ESX/ESXi host displays warning message when test condition is false (2008602).
 

Note: If the warning continues to appear, disable and re-enable VMware High Availability in the cluster.

To set das.ignoreRedundantNetWarning to true:

1. From the VMware Infrastructure Client, right-click on the cluster and click Edit Settings.
2. Select vSphere HA and click Advanced Options.
3. In the Options column, enter das.ignoreRedundantNetWarning
4. In the Value column, type true.
   
   Note: Steps 3 and 4 create a new option.
    
5. Click OK.
6. Right-click the host and click Reconfigure for vSphere HA. This reconfigures HA.

To set das.ignoreRedundantNetWarning to true in the vSphere 5.1 Web Client:

1. From the vSphere Web Client, right-click the cluster.
2. Click the Manage tab for the cluster, then under Settings click vSphere HA.
3. Click Edit in the top right corner.
4. Expand the Advanced Options section, and click Add.
5. In the Options column, type das.ignoreRedundantNetWarning.
6. In the Value column, type true.
7. Click OK.
8. Right-click the host and click Reconfigure for vSphere HA.

Additional Information

For more information on Service Console redundancy, see 
NIC teaming in ESXi and ESX
ESX/ESXi host displays warning message when test condition is false