في ظل الانتشار الواسع للشبكات الحديثة و السريعة و الحاجة لتطبيقات هامة و حرجة، أضحى موضوح المحافظة على الاستمرارية و الموثوقية العالية و تأمين جودة الخدمة المطلوبة شيئاً أساسياً. آليات التعافي (Recovery Mechanism) المتبعة من قبل شبكات IP الحالية تستغرق زمناً طويلاً من عدة ثوان إلى عدة دقائق, مما يؤدي إلى ضياع كبير في رزم البيانات. تُعتبر MPLS تقنية الجيل القادم في بنى الشبكات, التي يمكن أن تسرع إرسال الرزم إلى وجهتها عبر تبديل الوسوم و خصوصاُ مع تفوقها في هندسة الحركة. نالت آليات التعافي لـ MPLS شهرةً متزايدة لأنها تضمن الاسترداد السريع من الفشل مع ضمان عالٍ لجودة الخدمة.
نقوم في هذا البحث بمحاكاة عدة سيناريوهات لفشل الوصلة باستخدام تقنية إعادة التوجيه السريع (Fast Reroute) في شبكات MPLS عبر برنامج OPNET و تشير النتائج إلى نجاح هذه التقنية في الحد من التأخير و فقدان رزم البيانات في أثناء عملية الاسترداد.
With the widespread of new fast networks and need for critical application, survivability,
reliability and quality of service became an sensational issue. Recovery mechanism used by IP
network spent a lot of time from several seconds to minutes. This causes large drop in data
packages. MPLS is a next generation backbone architecture, which can speed up packet forwarding
to destination by label switching especially with its traffic engineering capability. MPLS recovery
mechanisms are increasing in popularity because they can guarantee fast restoration and high QoS
assurance.
We simulated in our research several scenarios for link failure using fast reroute technology
in MPLS network's using Opnet. Results lead us to consider this technique successful in limiting
delay and packet drop in recovery cycle.
References used
Yimin Qiu, Jinguang Gu, Hongbing Zhu, Yi Zhou, "MPLS-based Network Fault Recovery Research", International Journal of Intelligent Engineering & Systems,INASS, 2010, Vol.3, No.4, 201, pp. 40-47
Jose L Marzo, Eusebi Calle , Caterina Scoglio, Tricha Anjali, “Adding QoS Protection in Order to Enhance MPLS QoS Routing”, Proceedings of IEEE ICC, University de Girona, Spain, May 2003, pp. 1973 – 1977
Wajdi Al-Khateeb, Sufyan Al-Irhayim, Khalid Al-Khateeb, " Recovery Modeling in MPLS Networks " Proceedings of the Int. Conf. on Computer and Communication Engineering, ICCCE’06,IEEE, Vol. I, 9-11 May 2006, Kuala Lumpur, Malaysia, pp. 390-395
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