Traffic experience during during a Default Pool change.

I would recommend adding the new members in the pool and "disable" (will keep active and persistent connections) the old members. In this case, when you know there isnt any new traffic (by checking stats) you can remove the old pool members from the same pool group.

I have done it the other way by swapping pools and we did notice a few errors but nothing that had a "smoking gun" error that I could find from doing so...