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Improving Latency Using Mpls Essay

966 words - 4 pages

I. INTRODUCTION
Ethernet Latency can be defined as the time it takes for a network packet to get to a destination or the time it takes to come back from its destination. It also impacts the time an application must wait for data to arrive at its destination [1]. This is as important as download speed because a network with high latency (a slow network) will take a longer time to pass information about and this can have a negative effect as web pages will take longer to load as each request for the next picture, script or text has a significant delay in between [2]. Latency in a packet-switched network is stated as either one-way latency or Round-Trip Time (RTT). One-way latency is the time ...view middle of the document...

Latency impacts an application’s performance by forcing the application to stall while waiting for the arrival of a packet before it can continue to the next step in its processing. Excessive Latency creates bottlenecks which prevent data from filling the network pipe (Bandwidth) and also limits the performance of network application by delaying packet arrival [2]. This hinders high-quality network performance needed by sometime time-sensitive applications used by VoIP, Online games, Algorithmic trading [1].

Multi-Protocol Label Switching (MPLS) solves this Quality of Service (QoS) issue by setting up explicit paths through the network. It is a technique that facilitates high-performance transport of Internet Protocol (IP) traffic using label switching to forward packets which brings about minimum latency and which is also faster than the conventional method called packet switching [4]. The minimal latency in a network is the sum of the minimum latency of each link, plus the transmission delay (properties of the physical medium) of each link except the final one, plus the forwarding latency of each gateway but in practice this minimal latency is further increased by queuing and processing delays [17].
Queuing delay occurs when a gateway receives multiple packets from different sources heading towards the same destination. Since typically only one packet can be transmitted at a time, some of the packets must queue for transmission, incurring additional delay.
Processing delays (such as passing through proxy servers or making network hops on the network) are incurred while a gateway determines what to do with a newly received packet. The combination of propagation, serialization, queuing, and processing delays often produces a complex and variable network latency profile [17]. In order words, how fast the network device can process...

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