Using the TeamPolicyUpDelay setting

Products

• VMware vSphere ESXi

Issue/Introduction

Link failure detection and teaming/failover policies allow ESXi to redirect traffic to working uplinks when one or more network interfaces on the host are detected to be disconnected. 

The uplink is re-enabled when the connection is determined to be restored based on the failure detection policy. If failback is enabled, traffic is moved back onto the link. By default, there is a 100ms delay before this occurs.

The network card may report that the link state is active well before full connectivity is restored, for example, due to spanning tree protocol operation which can delay connectivity for 30 seconds. The TeamPolicyUpDelay setting can be configured to increase the delay to reduce the risk of packet loss in case this occurs.

See: Changing the network teaming failback delay fails in ESXi Host, Network Failure Detection Policy

Environment

VMware vSphere ESXi

Resolution

• The setting Net.TeamPolicyUpDelay can be changed in Advanced System Settings to adjust the delay in milliseconds before an uplink is re-enabled.
• For example, a setting of 60000 will wait 60 seconds (1 minute) before a network interface is considered usable.
• This setting takes effect immediately in ESXi 8.0.

Additional Information

• This setting Net.TeamPolicyUpDelay is applicable only on NICs configured as Active/Standby in NIC teaming.
• It is not applicable for NICs configured as Active/Active  in NIC teaming or Channeled using LACP / Ether-Channel.