Application-Aware Data Center Network Bandwidth Utilization: the case of ethio telecom
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Date
2018-11
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Publisher
AAU
Abstract
The existing ethio telecom data center network (DCN) is the traditional model which provides
only the Best Effort (BE) traffic delivery service on a layer three links with the same priorities for
all applications traffic. A diversity of applications is running on the data centers, the scarcity innetwork
bandwidth of data centers become the performance bottleneck for the integration of
enterprise systems. The most important point is that the existing network has not a dynamic
bandwidth management strategy, which lacks of flexible bandwidth utilization among different
types of applications. To guarantee the network performance for system integration, an efficient
in-network bandwidth management should be considered.
In this thesis work, a QoS model for an aggregated applications traffic in the DCN with a
constrained bandwidth and with a consideration of the business criticality of the applications has
been designed. The model nearly supports guarantees of QoS to real-time traffic without reserved
bandwidth, and it assured forwarding high priority class traffic for business and mission critical
applications. The design approach is based on the Internet Engineering Task Force (IETF)
Differentiated Service(DS) Per-Hop-Behavior (PHB) group. Different types of Active queue
management(AQM) and packet scheduler algorithms have been compared on the proposed design
to minimize the packet loss and delay of each aggregated traffic class. In addition, the dynamic
Benefit weighted scheduling (DB-WS) algorithm is modified to adapt with our solution, the
algorithm dynamically allocated bandwidth based on the average queue length of each service
class.
Extensive simulation results have shown that our proposed design is capable of improving the
bandwidth utilization as well as providing desirable network performance for real-time and
business-critical applications on a bottleneck link and also reduce the total packet loss by 1.34 %.
Description
Keywords
Quality of Service (QoS), Differentiated Service (DiffServ), Differentiated Service Code Point (DSCP), Expedited Forwarding (EF), Assured Forwarding (AF), constrained bandwidth, Active queue management(AQM), bandwidth allocation