A Study on the Performance of a Three-Stage Load-Balancing Switch

A STUDY ON THE PERFORMANCE OF A THREE-STAGE LOAD-BALANCING SWITCH

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ABSTRACT:

There has been a great deal of interest recently in load-balancing switches due to their simple architecture and high forwarding bandwidth. Nevertheless, the mis-sequencing problem of the original load-balancing switch hinders the performance of underlying TCP applications. Several load-balancing switch designs have been proposed to address this mis-sequencing issue. They solve this mis-sequencing problem at the cost of either algorithmic complexity or special hardware requirements. In this paper, we address the mis-sequencing problem by introducing a three-stage load-balancing switch architecture enhanced with an output load-balancing mechanism. This three-stage load-balancing switch achieves a high forwarding capacity while preserving the order of packets without the need of costly online scheduling algorithms. Theoretical analyses and simulation results show that this three-stage load-balancing switch provides a transmission delay that is upper-bounded by that of an output-queued switch plus a constant that depends only on the number of input/output ports, indicating the same forwarding capacity as an output-queued switch.

EXISTING SYSTEM:

There has been a great deal of interest recently in load balancing switches due to their simple architecture and high forwarding capacity. A typical load-balancing switch consists of a two-stage switching fabric and a one-stage buffer sandwiched between the two switch fabrics where each fabric executes a periodic connection pattern. The idea behind this kind of design is that the input traffic with an arbitrary distribution becomes uniformly distributed through the first-stage switch fabric and then is fully forwarded by the second-stage switch fabric. Thus, high throughput is achieved while the architecture remains scalable. However, such a load-balancing switch suffers amis-sequencing problem; that is, the order of packets may not be preserved during the transmission process. Mis-sequencing is undesirable because it hinders the efficiency of TCP connections.

DISADVANTAGES OF EXISTING SYSTEM:

·       It has mis-sequencing problem.

·       It is more costly.

·       It is not scalable.

PROPOSED SYSTEM:

In this paper, we introduce a new load-balancing switch, called the three-stage load-balancing (3SLB) switch, which effectively solves the mis-sequencing problem without the need of costly online scheduling algorithms or hardware speedup. The switch architecture studied in this paper was originally proposed by Wang. The work presented in this paper significantly extends these initial efforts, providing a thorough theoretical analysis and evaluating its performance through extensive simulations. The most significant difference between the 3SLB switch and prior load-balancing switches is the third stage of the 3SLB switch in which packets are buffered in an output load-balancing fashion and forwarded in order of ascending arrival time. With the third stage, the order of packets is preserved without using any complex real-time scheduling algorithm; the overall online scheduling complexity of the 3SLB switch. Thus, the 3SLB switch retains the scalability of prior load-balancing switches.

ADVANTAGES OF PROPOSED SYSTEM:

·       The complexity of the online scheduling algorithm inside a 3LSB switch is , and no hardware speedup is required.

·       Low average delay: By simulation, we show that the 3SLB switch has a much lower average delay than existing IQ switches under heavy inputs as well as bursty inputs.

SYSTEM ARCHITECTURE:

SYSTEM CONFIGURATION:-

HARDWARE REQUIREMENTS:-

ü Processor                  -        Pentium –IV

ü Speed                        -        1.1 Ghz

ü RAM                         -        512 MB(min)

ü Hard Disk                 -        40 GB

ü Key Board                -        Standard Windows Keyboard

ü Mouse                       -        Two or Three Button Mouse

ü Monitor                     -        LCD/LED

SOFTWARE REQUIREMENTS:

•         Operating system :         Windows XP

•         Coding Language :         Java

•         Data Base             :         MySQL

•         Tool                     :         Net Beans IDE

REFERENCE:

Yan Cai, Xiaolin Wang, Weibo Gong, and Don Towsley, “A Study on the Performance of a Three-Stage Load-Balancing Switch” IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 22, NO. 1, FEBRUARY 2014.