Impact of shutting down or bringing up an aggregate interface

By default, an aggregate interface is up. Shutting down or bringing up an aggregate interface affects the aggregation states and link states of member ports in the corresponding aggregation group as follows:

When an aggregate interface is shut down, all Selected ports in the corresponding aggregation group become Unselected ports and all member ports go to an operationally down state.
When an aggregate interface is brought up, the aggregation states of member ports in the corresponding aggregation group are recalculated. LAG members, which are administratively up, will become operationally up. The members that are not administratively up will be in the same state and not made eligible for aggregation.