Abstract
In order to satisfy the quality of service (QoS) requirements of the applications on Internet, the Internet Engineering Task Force (IETF) has defined two network service architectures: IntServ/RSVP (integrated service / resource reservation protocol) and DiffServ (differentiated service). Both architectures need a QoS routing mechanism and algorithm to find out an adapted route. Moreover, MPLS (multi-protocol label switching) can be used in these architectures to perform explicit routing. Based on existing routing algorithms, we propose a new pre-computed QoS routing algorithm which we call CCPF (classified minimum cost path first), which uses bandwidth as a basic metric and takes a weighted cost function as a path optimal criterion. We compare our algorithm with existing ones using simulation, and found that it can get different routes among different bandwidth-ranges to support multiple service modes. This can improve network performance.
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