on the tree are temporarily disabled--until one of the links on the main tree fails, and the routers calculate a new tree using those links to route around the broken link.

Routers that use other adaptive protocols, such as grouped adaptive routing, find a group of all the links that could be used to get the packet one hop closer to its final destination.The router sends the packet out any link of that group which is idle.The link aggregation of that group of links effectively becomes a