M141. Analiza practica a strategiilor de QoS pentru o retea de campus
1. Tema proiectului
Proiectul isi propune identificarea celor mai utilizate tehnici de control si management al traficului intr-o reţea. In urma acesteia se vor obţine rezultate concludente si recomandări – best practices – pentru scenarii asemănătoare.
2. Obiective
Studiul trebuie sa aibă in vedere tehnicile de QoS utilizate in prezent, tendinţe si provocări din domeniu.
Implementarea studiului se va face intr-o reţea de tip campus, cu toate particularităţile ce rezulta din specificul acesteia. Simularea reţelei se va face utilizând platforma de virtualizare Dynamips. Pentru generarea de trafic se vor folosi aplicaţii precum Jperf, TrafficSwarm, etc
Structura lucrării va fi compusa din trei parţi:
- Prezentarea unei reţele de campus, structura specifica si particularităţile acesteia:
- Fluxul de date si forma acestuia
- Fluxul de voce – o noua realitate tot mai prezenta
- Vulnerabilitati si „neajunsuri” in cadrul retelei
- Studiul algoritmilor de QoS si eficienta acestora:
- Principii de design pentru QoS
- Metode si instrumente de clasificare a traficului
- Policing&Traffic shaping
- Evitarea congestiilor in cadrul retelei
- Integrarea politicii de QoS si folosirea acesteia in cadrul unor VPN-uri
- Implementarea algoritmilor in cadrul reţelei de test, efectuarea de măsurători – grafice si rezultate obţinute:
- Crearea unei topologii specifice unei retele de tip campus
- Optimizarea traficului in retea conform cerintelor fiecarui segment/departament
- Masurarea rezultatelor obtinute si evidentierea lor precum si a eventualelor proiecte de viitor
3. Bibliografie
[1] Amir Ranjbar CCIE No 8669 – Cisco.Press.CCNP.ONT.Official.Exam.Certification.Guide, Cisco Press 2007
[2] Tim Szigeti – CCIE No. 9794, Christina Hattingh – End-to-End Qos, Cisco Press 2004
[3] Mike Hicks – Optimizing applications on Cisco Networks, Cisco Press, 2004
4. Detalii de desfăşurare
- coordonator proiect: conf. dr. ing. Razvan Rughinis
- echipa: Bârhală Florin, DEDU Catalin
- cunoştinţe necesare: retelistica
- sala: EF303 – sâmbăta 13:00
5. Rezultatele primului semestru
QoS Solutions analysis
As I stated in the introduction, this paper managed to achieve its starting main research points.
Iperf proves to be a very useful and reliable tool, anytime a traffic generator tool is needed. Its extended capabilities on both TCP and UDP make it a versatile tool to work with. Any carrier issues like TCP window filtering or MTU fragmentation can be discovered using Iperf and its options richness. As IPv6 is knocking most of today’s networks, MTU path bottlenecks detection will prove more and more useful until the ISP majority will work out with this.
If TCP proves not that competitive when trying to achieve high bandwidth values, it is of a great help to monitor and benchmark any connection real-time bandwidth capabilities. On contrast UDP can generate traffic up to the physical line bandwidth limits, due to his scalability working on multiple parallel threads.
The second competitor for traffic generators – IP SLA – it is to be used on further projects and although it’s even powerful than Iperf, when I are to compare its capabilities, the platform restriction – it runs only on Cisco appliances – severely restraints its real-life applicability and use.
The small QoS scenario used for implementation managed to correctly “pop up” CBWFQ QoS algorithm usefulness, and most of all: the results. Each graphic underline the results and precisely indicate a best utilization scenario for each one at a time. It is important to know every QoS working base algorithm but also it is vital not to mix them up and use each of them at their best, depending upon any specific scenario requirements.
