Policy Routing of Multicast

Administrative scoping, tunnels and redistribution centres all have a common aim - to control the routing of multicast traffic so that the receiver and sender groups are constrained. This should really be controlled by the routing protocol, in the same way that the Border Gateway Protocol controls the placement of unicast routes. However, as yet, none of the multicast routing protocols appear to have properly addressed the question of policy (although PIM is doing better than any of the others).

One can expect to see a multicast policy and QoS routing protocol appear from out of the IETF within the next year or two.