The Internet protocol (IP) was created as a connectionless network layer protocol that takes no attempt to distinguish between various application types. Hence, the integration of a wide range of telecommunication services over the Internet is the main reason behind the need for the provision of quality of service (QoS) guarantees to end users. In such multiservice networks, resources are managed based on service level agreements (SLA), acknowledging different types of traffic in terms of bandwidth requirements, delay and other QoS parameters. An SLA is the documented result of a negotiation between a customer and a service provider that defines service characteristics, responsibilities and priorities of every party. An SLA may include statements about tariffing and billing, service delivery, and compensations. This paper provides a short overview of some aspects of quality of service, and identifies main issues and problems of defining and managing an SLA, based on its current standardization stage.
Keywords
Abstract. This paper presents a fast on-line routing algorithm for dynamic routing of label switched paths (LSPs) with bandwidth guarantees in MPLS networks, which handles requests that arrive one at a time without exploiting a priori knowledge of the traffic characteristics. Trying to avoid exacting calculations for each on-demand LSP request (e.g., maximum flow computation), we introduce a new link weight function for path selection. The link weights are calculated as a function of residual network and link capacity, hence we call the approach Residual Network and Link Capacity (RNLC) routing algorithm. In terms of computer simulations we compare the performance of this new routing algorithm with four other on-line routing algorithms in two different network scenarios. Simulation results exhibit better performance of RNLC even if compared to more complex algorithms. We highlight that the new algorithm is fast and scalable due to its considerably low complexity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.