tnLagPortThreshold is a threshold for tnLagPortThresholdAction. When a physical port link state changes and the number of operational physical ports is less than or equal to tnLagPortThreshold, tnLagPortThresholdAction is invoked: either the LAG is set operationally down, or the protocols operating on the LAG interface are adjusted. When the number of operational physical ports becomes greater than tnLagPortThreshold, tnLagPortThresholdAction is revoked: either the LAG is set operationally up, or the protocols operating on the LAG interface are adjusted. The value zero means tnLagPortThresholdAction is never invoked. To invoke dynamicCost at every physical port state change, set tnLagPortThreshold to the total number of physical ports configured to be in the Link Aggregation Group.