Choosing a primary route that is known a priori to have sufficient resources might work fine for intradomain QoS routing but is not likely to work for interdomain QoS routing. Failed Primary routes with alternate routing are needed when a request fails. Daniel's work has focused on mechanisms for constructing alternate routes. It is necessary to use an architecture that has a QoS Mgr to talk to routing. Local route construction may be used for scaling.
Work is needed to figure out how a node can compute a local or source route.
Route pinning must be complete throughout the end to end path to avoid routing loops. This means that the entire route must be known. Some questions were raised regarding the apparent assumption that PIM would be used for multicasting routing. People were concerned that the techniques were not generic enough to be applied to other routing protocols. The problem is to find a path through the network efficiently.