A QoS-aware routing framework for PIM-SM based IP-multicast

We propose a PIM-SM based IP-multicast routing framework for delivering heterogeneous quality of service to multicast receivers. We propose two tree construction algorithms: TIQM (relying on the full availability of tree-specific information about a multicast group) and NUQM (not requiring any tree specific information). While TIQM is able to compute pseudo-optimal QoS-constrained trees, it has a control-scalability problem. This problem is overcome in NUQM by restricting the amount of information used during tree computation. For realistic networks, under low to moderate network load and receivers´ bandwidth requirements, performance of NUQM is close to that of TIQM. A QoS-extended intra-domain PIM-SM framework is also presented