ارائه يك الگوریتم تعادل بار مبتنی بر پیش‌بینی در شبکه‌های نرم‌افزارمحور
محورهای موضوعی : مهندسی برق و کامپیوترحسین محمدی 1 , سیداکبر مصطفوی 2
1 - دانشگاه یزد،دانشکده مهندسی کامپیوتر
2 - دانشگاه یزد،دانشکده مهندسی کامپیوتر
کلید واژه: شبکه‌های نرم‌افزارمحور, توازن بار, الگوریتم‌های پیش‌بینی, ماشین یادگیری افراطی,
چکیده مقاله :
شبکه‌های نرم‌افزارمحور یک معماری جدید در شبکه است که لایه کنترل را از لایه داده جدا می‌سازد. در این رویکرد مسئولیت لایه کنترل به نرم‌افزار کنترلر واگذار می‌شود تا رفتار کل شبکه را به طور پویا تعیین نماید. نتیجه این امر، ایجاد یک شبکه بسیار منعطف با مدیریت متمرکز است که در آن می‌توان پارامترهای شبکه را به خوبی کنترل کرد. با توجه به افزایش روزافزون کاربران، ظهور فناوری‌های جدید، رشد انفجاری ترافیک در شبکه، برآورده‌سازی الزامات کیفیت خدمات و جلوگیری از کم‌باری یا پرباری منابع، تعادل بار در شبکه‌های نرم‌افزارمحور ضروری می‌باشد. عدم تعادل بار باعث بالارفتن هزینه، کاهش مقیاس‌پذیری، انعطاف‌پذیری، بهره‌وری و تأخیر در سرویس‌دهی شبکه می‌شود. تا کنون الگوریتم‌های مختلفی برای بهبود عملکرد و تعادل بار در شبکه ارائه شده‌اند که معیارهای متفاوتی مانند انرژی مصرفی و زمان پاسخ سرور را مد نظر قرار داده‌اند، اما اغلب آنها از ورود سیستم به حالت عدم تعادل بار جلوگیری نمی‌کنند و خطرات ناشی از عدم تعادل بار را کاهش نمی‌دهند. در این مقاله، یک روش تعادل بار مبتنی بر پیش‌بینی برای جلوگیری از ورود سیستم به حالت عدم تعادل بار با بهره‌گیری از الگوریتم ماشین یادگیری افراطی پیشنهاد می‌شود. نتایج ارزیابی روش پیشنهادی نشان می‌دهد که از نظر تأخیر پردازش کنترل‌کننده، میزان تعادل بار و زمان پاسخ‌گویی به علت تعادل بار بهینه نسبت به روش‌های CDAA و PSOAP عملکرد بهتری دارد.
Software-defined networking is a new network architecture which separates the control layer from the data layer. In this approach, the responsibility of the control layer is delegated to the controller software to dynamically determine the behavior of the entire network. It results in a flexible network with centralized management in which network parameters can be well controlled. Due to the increasing number of users, the emergence of new technologies, the explosive growth of network traffic, meeting the requirements of quality of service and preventing underload or overload of resources, load balancing in software-based networks is of substantial importance. Load imbalance increases costs, reduces scalability, flexibility, efficiency, and delay in network service. So far, a number of solutions have been proposed to improve the performance and load balancing in the network, which take into account different criteria such as power consumption and server response time, but most of them do not prevent the system from entering the load imbalance mode and the risks of load imbalance. In this paper, a predictive load balancing method is proposed to prevent the system from entering the load imbalance mode using the Extreme Learning Machine (ELM) algorithm. The evaluation results of the proposed method show that in terms of controller processing delay, load balance and response time, it performs better than CDAA and PSOAP methods.
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