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Policy Based Network Architecture in Support for Guaranteed QoS
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Abstract
Current Internet architecture is based on the Best Effort (BE) model, where packets can be dropped indiscriminately in the event of congestion. Though such a model works well for certain traditional applications such as FTP, E-mail and less QoS constrained applications, it can be intolerable for newly emerged real-time, multimedia applications such as Internet Telephony, Video-Conferencing and Video on-Demand. Such applications have a strict demand for high bandwidth, low delay and low jitter. Current research is focused towards providing better than BE services over the Internet thereby providing a better Internet architecture which is scalable and will enable end-to-end QoS. This paper is based on the ongoing research activities being carried out by various researchers in the area of QoS and proposes a Policy Based Network (PBN) for the next generation Internet.
FAQs
AI
What are the drawbacks of the Int-serv architecture for QoS?
The Int-serv architecture suffers from significant scalability issues due to managing millions of traffic flows, making it impractical for widespread use. This was highlighted by its reliance on Resource Reservation Protocol (RSVP) for signaling, which is challenging in large-scale environments.
How does the proposed three-tier model enhance QoS over existing approaches?
The proposed three-tier model enables both scalability and finer-grained end-to-end QoS by structuring resource management through an Inter Network Policy Database, Service Provider PDB, and Customer PDB. This architecture integrates administrative control, traffic engineering, and signaling distinctly to address multiple domain challenges.
What role does the Bandwidth Broker (BB) play in the proposed architecture?
The Bandwidth Broker acts as a central Policy Decision Point (PDP), managing policy rules and resource allocation across network devices. It validates policies and facilitates communication for ensuring end-to-end QoS within a unified framework.
Which signaling protocols are recommended for inter-domain QoS management?
The study advocates using Border Gateway Reservation Protocol (BGRP) and/or SIBBS for inter-domain signaling due to their efficient reservation aggregation and reduced complexity. This choice aims to simplify bandwidth reservation processes while maintaining compatibility with existing architectures.
What practical challenges does the Diff-serv model encounter in real-world applications?
The Diff-serv model has challenges such as insufficient end-to-end QoS guarantees and policy conflicts across domains, stemming from its reliance on administrative control mechanisms. Moreover, dynamic resource allocation and cross-domain traffic management still require further research to streamline operations.
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