Killer Reservation problem arises when RSVP request messages are merged over multicast tree. Some of single RSVP request messages will succeed, if they are not merged. But, when they are merged with other RSVP request messages, this merged request fail admission control at nodes that do not support reservation request needed at that moment for the merged request [1, 3, 4]. In this paper we present a new approach to solving the mentioned problem based on link-state algorithm and source QoS routing. Merging nodes have a global view of network QoS states and regarding to that information locally decide to not forward Resv messages, to forward single flowspec or to merge two or more flowspecs. In this way it is avoided necessary sending Resv messages, single or merged, over links trying to reserve resources without knowledge should they succeed. In addition, we propose two additional conditions as annex to the proposed approach. First condition (I) prevents router overloading and second condition (II) disables merging flowspecs over longer path if the shorter path is available. Condition (II) minimizes delay, jitter and loss probability.

Elektrotehnika