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QoS-OSPF
RFC 2676:  QoS Routing Mechanism and OSPF Extensions was written by G. Apostolopoulos, D. Williams, S. Kamat, R. Guerin, A. Orda and T. Przygienda, in August 1999. Here I'm trying to make a brief summary of this document:
The goal with Q-OSPF is to support QoS routing using the OSPF routing protocol. This implies the following objetives:
  1. Obtain the information needed to compute QoS paths and select a path capable of meeting the QoS requirements of a given request.
     
  2. Establish the path selected to accomodate the request.
     
  3. Maintain the path assigned.