insert barcode in excel 2016 Configuring Weighted Random Early Detection in Software

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Configuring Weighted Random Early Detection
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To use WRED on a Cisco router, all you need to do is issue a single command at the interface where you want it to take effect For example, the command
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Router(config-if)#random-detect will activate WRED on that particular interface Although the IP Precedence bit determines how traffic is discarded, you can override the default by using the random-detect command with the precedence command
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Currently, various mechanisms are used to control the characteristics of traffic being allowed into a network Called traffic shaping, this process is primarily used at ingress routers Network operators are starting to use traffic shaping to condition internal links for better service quality on their internal internetworks Remember, network managers are faced with the reversal of the "80/20 rule" and transition to the current pattern in which as much as 75% of traffic in a private autonomous system is part of an external connection By definition, traffic shaping is the practice of controlling the volume of packets entering a network and controlling the rate of transmission in order to make traffic conform to a desired pattern The name comes from the fact that a traffic flow is said to have been shaped when its pattern is changed The two predominant ways to shape traffic are the leaky bucket and token bucket mechanisms
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A leaky bucket controls the rate at which packets enter a network, by manipulating inbound queues to smooth bursty traffic into less-variable flows As mentioned, ATM invented the leaky bucket as a way to control the rate at which ATM cell traffic is transmitted over an ATM link This mechanism has come into use more recently to condition IP packet datagram flows
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A leaky bucket is configured by setting two parameters: the maximum bucket depth (queue size limit), set as total bytes, and the maximum permitted transmission rate, set as bytes per second The primary benefit of leaky bucket traffic shaping is improved predictability of performance over a link It's the most straightforward and easy-to-implement QoS mechanism there is, and it's especially popular for controlling flows when capacity is oversubscribed The occasional dropped packet discourages congestion by triggering TCP to send reduced window sizes, or even negative acknowledgements (NACKs) back to the originating host Leaky bucket's downside is that the excess packets are discarded when traffic backs up beyond the bucket's depth Also, because the "leak rate" is a fixed parameter that cannot adjust itself in realtime, bandwidth is wasted when traffic volume is less than the fixed leak rate
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The token bucket mechanism, though similar in name, is quite different from the leaky bucket A token bucket is the practice of controlling the transmission rate based on the presence of so-called tokens in the bucket In other words, a token is an abstract currency (measured in bytes) that must be available at any instant for the next FIFO packet to exit the network interface There must be at least as many token bytes available as the number of bytes in the packet to be transmitted
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The number of tokens in the bucket is a configurable parameter A burst-rate threshold parameter can also be configured to limit the number of tokens used by the packet stream of a single flow A token bucket is more flexible than a leaky bucket in that it will allow bursty traffic to transit the interface as long as sufficient tokens are available Although both the token bytes parameter and burst-rate threshold are fixed, a token bucket is more efficient than a leaky bucket because available bandwidth is more likely to be used when traffic is light Having one token bucket and one burst-rate threshold tends to negate the objectives of a Class of Service (CoS) prioritization scheme For example, if there are gold, silver, and bronze traffic classes entering a router that's operating a single token bucket, token unavailability and peak rate threshold will weigh as heavily on gold as on bronze packets A common practice, then, is to operate several token buckets, one for each class of service Note that this requires implementing three separate output queues
Gold-class packets would be afforded more tokens and a higher peak burst-rate threshold than would silver packets, with lower still parameters for bronze packets Permitting classes to be shaped independently lets the administrator establish which types of traffic get the good (high peak burst rates) and which are most likely to experience the worst (packet loss for lack of available tokens) Properly configured, the token bucket mechanism doesn't incur the inherent bandwidth inefficiency of leaky buckets
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