QoSR
Goal: reduce computational and propagation overheads
Infrequent, periodic, coarse updates of QoS routing information
Limit the scope of updates
Hierarchical aggregation (e.g. ATM PNNI, QOSPF)
- group close nodes into areas
- group areas into level-2 areas, and so on
- cons: loss of detailed QoS information
ToS routing or QoS routing based on engineered capacities (rather than actual utilizations) would scale better among different domains