The LAG port threshold feature allows configuration of the behavior, when the number of available links in a LAG falls below or is equal to the specified threshold. Two options are available:
If the number of links available (up) in a LAG is less than the configured threshold, then the LAG is regarded as operationally down. For example, assume a LAG consists of four physical links. The threshold is set to two and dynamic costing is not configured. If the operational links is equal to or drops below two, the link is regarded as operationally down until the number of operational links is two or more.
When the number of links available in a LAG is less than the configured threshold, the LAG starts using the dynamic-cost allowing other nodes to adjust their routing tables according to the revised costs. In this case, when the threshold is not crossed, a fixed metric (all links operational) is advertised.